Best Split King Mattress of 2026

The split king is a simple solution to age-old problems that often arise when sharing a bed. This mattress type gives each partner their own sleeping area by placing two separate mattresses next to each other, which can be invaluable for couples, as it doesn’t transfer motion.

How We Tested the Best Split King Mattresses

Testing Criteria

Split-king mattresses offer a combination of shared sleep space and individual comfort control. Because this size comprises two separate mattresses placed side by side, availability at retailers and performance across core comfort metrics are especially important. The following factors guided our evaluation of the best split-king mattresses available.

• Availability: Not all mattress models are offered in split-king format, and availability can vary by retailer, construction, and firmness options. We prioritized mattresses that are widely accessible through major retailers, making it easier for shoppers to compare, try, and purchase with confidence.
• Customer Ratings: Real-world feedback can offer helpful insight into how a mattress performs over time. We read through verified sleeper reviews to get a better understanding for long-term comfort, support, and overall satisfaction with split-king beds.
• Motion Isolation: Split-king setups can inherently reduce motion transfer between sides because the bed consists of two separate mattresses. We still evaluated how well each model controls movement on each side to minimize disruption, especially for couples with different sleep preferences.
• Edge Support & Ease of Movement:
  Because each side of a split king is effectively a twin XL mattress, edge support matters for expanding usable surface area. We evaluated how well each model performs at the perimeter and how easily sleepers can shift positions or get in and out of bed.

How We Evaluated

Because split-king mattresses function as two separate sleep surfaces, our evaluation emphasized both individual performance and overall consistency. We combined availability checks with performance data and hands-on testing in our Seattle Test Lab.

We began by reviewing models offered in split-king format and assessing sleeper ratings and lab scores across core performance categories, including:
Variety of firmness options

• Temperature control
• Top-tier construction and materials
• Durability

Our testing focused on evaluating split-king mattresses that demonstrated reliable performance on each side of the bed while remaining widely available through major retailers. Our experienced testing team rated each mattress based on their comfort layering, support balance, responsiveness, and stability.

Multiple testers also assessed how each mattress performs in a split-king setup, focusing on how well each side functions independently for sleepers with different body types and sleep positions.
After assigning accolades to each option, we selected these split king mattresses as the best.

Our Testing Team

Logan Foley

Editorial Director

Full Bio

Logan Foley

Editorial Director

Logan is a Certified Sleep Science Coach with a deep understanding of what it means to struggle with sleep. Her years of experience researching and testing sleep products – including mattresses, natural sleep aids, and bedding – are critical to her role helping lead the editorial team. When she’s not testing mattresses or researching CBT-I, she enjoys spending time in the sunshine with her husband and her dogs Pepper and Winston.

Mary Fenton

Head of Product Content

Full Bio

Mary Fenton

Head of Product Content

Mary is a product-content marketer who applies a pedigree in journalism, human-centered design, and cultural trends to inform strategy. Prior to Sleep Doctor, Mary led editorial and creative at ESPN and Rad Power Bikes. She likes to build and grow things, and break and fix things, and only sometimes in that order.

Jeremy Klein

Senior Product Testing Manager

Full Bio

Jeremy Klein

Senior Product Testing Manager

Jeremy is a sleep product tester with a passion for methodology and data collection. He’s spent the last six years at Sleep Foundation testing nearly every mattress, pillow, and sheet on the market, and has gained a holistic understanding of how to get the most accurate and universal results possible. When he’s not working, Jeremy likes to make music, play tennis, and watch old movies.

Brad Nehring

Senior Product Analyst

Full Bio

Brad Nehring

Senior Product Analyst

Brad is a lifelong resident of the Pacific Northwest who holds a bachelor’s degree in English from Western Washington University. As someone who has lived with sleep problems throughout his adult life, Brad is passionate about helping others get the rest they need. He’s professionally tested and reviewed sleep products for nearly a decade.

Colin Simpson

Product Research Manager

Full Bio

Colin Simpson

Product Research Manager

Colin leads our product research team and doubles down as our head of video production. He has a distinct passion for translating complicated topics into fun and digestible content.

Best Overall: Winkbed

Best Overall

9.4/10Test Lab Score

WinkBed

High end hybrid bed providing ample support, cushion, and cool sleep.

30% off all WinkBeds mattresses Shop At WinkBeds

Price: $2,570

Mattress Type: Innerspring

Firmness Options: Medium Soft (4), Medium Firm (6), Firm (7), Firm (8)

Trial Period: 120 nights (30-night requirement)

Key Details

• Who It’s Best for: Couples, people with back pain, and any sleeper type regardless of preferred position or body type – though selecting the right firmness is important.
• Feel: Available in four designs. These include plush medium soft (4), balanced medium firm (6), supportive firm (7), and ultra-responsive “Plus” (8).
• What It’s Made of: The Plus contains a comfort layer of zoned latex, while the other three are constructed with adaptive foam comfort layers. All feature a support core of zoned pocketed coils with perimeter support.
• What We Don’t Like: Off-gassing odor can be harsh for the first 72 hours after unboxing.

Scoring & Reviews

The following ratings show how suitable this mattress is for different sleeping positions and sleeper weights. These scores are determined by how well the mattress supports and relieves pressure for each sleeper type.

Side Sleepers

Under 130 lbs

9.5/10

130-230 lbs

10/10

Above 230 lbs

9.5/10

Back Sleepers

Under 130 lbs

8.5/10

130-230 lbs

8/10

Above 230 lbs

7/10

Stomach Sleepers

Under 130 lbs

8.5/10

130-230 lbs

7.5/10

Above 230 lbs

6.5/10

In addition to the hands-on feedback from our team, we conduct a number of quantitative tests in our Test Lab. The below ratings are based on the experience of our testers.

Performance

Motion Isolation6.5/10

Temperature Control9/10

Pressure Relief8/10

Edge Support9.5/10

Durability8/10

Ease of Movement7.5/10

Read Our Full WinkBed Review

The WinkBed is a standout split king mattress because it’s versatile, well-crafted, and exceptionally supportive. This luxury hybrid pairs an adaptive comfort system with zoned coils, resulting in a design that reinforces heavier areas of the body without feeling excessively stiff beneath the head and legs. Four firmness levels are available, ensuring most people can find a comfortable option regardless of how much they weigh and which sleep position they prefer, and WinkBeds’ generous trial period allows for free exchanges if you aren’t satisfied with your initial selection.

How It Performed

Our testing shows the medium soft feel is best suited to side sleepers up to 230 pounds and back sleepers under 130 pounds. This model’s foam layers provide deep cushioning, so people who weigh more — stomach sleepers in particular — may sink to an uncomfortable degree. These individuals will likely find the medium firm or firm designs most comfortable. We found the WinkBed Plus provided adequate support for back and stomach sleepers weighing more than 230 pounds, but felt a bit too firm for the rest of our testing team.

Construction Breakdown

The WinkBed’s construction depends on which firmness you choose. Standard models available in medium soft (4), medium firm (6), and firm (7) feels begin with adaptive polyfoam quilted to the bottom of the cover, creating a bit of plushness when you get into bed. A second foam layer follows, but its denser composition keeps your body upright while cushioning sensitive areas along the spine. A fourth firmness option, the WinkBed Plus (8), is specifically designed for people who weigh more than 230 pounds. This model swaps out the second foam layer for 2.5 inches of zoned latex.

All WinkBed mattresses feature pocketed coils in their support cores. Thicker coils beneath your midsection push back against the extra weight from your torso and hips, and also line the perimeter to minimize sinkage when you sleep near the edges or get in and out of bed. A breathable, moisture-wicking Tencel cover encases the mattress, completing its luxury hybrid design.

Trial, Shipping, and Warranty

WinkBeds provides free ground shipping in the contiguous United States. The initial sleep trial runs for 120 nights. If you decide to exchange for a softer or firmer model during this time frame, the replacement comes with its own 60-night trial. WinkBeds’ also backs each purchase with a lifetime warranty.

Best Mattress and Adjustable Base Combo: Nectar Adjustable Bundle

Best Mattress and Adjustable Base Combo

8.5/10Test Lab Score

Nectar Adjustable Bundle

An all-inclusive sleep bundle at a terrific price.

Save up to 50% on mattresses + 15% off regular prices Shop At Nectar

Price: $1,398

Mattress Type: Adjustable Bed

Firmness Options: Medium Firm (6)

Trial Period: 50 nights

Key Details

• Who It’s Best for: Anyone looking to refurnish their mattress, bed frame, sheets, and pillows at a reasonable cost.
• Feel: Nectar mattresses available with the bundle range from medium firm (6) to firm (7), but all offer a balance of contouring and support.
• What It’s Made of: Construction varies by model, but all Nectar mattresses feature adaptive memory foam comfort layers. Some contain high-density polyfoam support cores, while hybrid models have pocketed coil support systems instead.
• What We Don’t Like: Adjustable bed bases have motors that make some noise. While Nectar’s bases have a quiet operation, they aren’t silent and may not be ideal for those who wake up easily.

Scoring & Reviews

The following ratings show how suitable this mattress is for different sleeping positions and sleeper weights. These scores are determined by how well the mattress supports and relieves pressure for each sleeper type.

Side Sleepers

Under 130 lbs

7.5/10

130-230 lbs

9/10

Above 230 lbs

7.5/10

Back Sleepers

Under 130 lbs

7/10

130-230 lbs

8.5/10

Above 230 lbs

7/10

Stomach Sleepers

Under 130 lbs

5.5/10

130-230 lbs

7/10

Above 230 lbs

5.5/10

In addition to the hands-on feedback from our team, we conduct a number of quantitative tests in our Test Lab. The below ratings are based on the experience of our testers.

Performance

Motion Isolation8.5/10

Temperature Control5.5/10

Pressure Relief8.5/10

Edge Support7/10

Durability6.5/10

Ease of Movement5.5/10

A new mattress and adjustable bed can be a useful investment if you deal with frequent shoulder, back, or hip pain — but most of these purchases amount to thousands of dollars. Nectar’s Adjustable Bundle is much more affordable than the average mattress-and-base combo, and you’ll also receive pillows and a sheet set with your order.

How It Performed

How your Nectar Adjustable Bundle performs largely depends on which mattress model you choose. That said, most side sleepers on our team weighing at least 130 pounds say all mattresses in the Nectar lineup meet their needs. Back sleepers up to 230 pounds also found most Nectar mattresses comfortable.

Our tests show all Nectar models excel at motion isolation for couples and alleviate pressure well. You may notice some heat buildup on Nectar mattresses due to their thick memory foam comfort layers, so cooling sheets or a breathable mattress protector are recommended.

Construction Breakdown

Six Nectar mattresses are available with the bundle. These options include the all-foam Nectar Mattress, Nectar Premier, and Nectar Premier Copper models, or the Nectar Hybrid, Nectar Premier Hybrid, and Nectar Copper Hybrid if you prefer a coil-based support system. You can also choose between two adjustable bases, the Classic and Premier — the former costs less, while the latter has more bells and whistles. Two pillows, a sheet set, and a mattress protector complete the bundle.

We recommend the Premier base if you are hoping to alleviate aches and pains. A customizable three-zone massage function produces gentle vibrations to reduce discomfort where you feel it most. You can also choose between a wide range of upper and lower body positions, including zero gravity with your legs elevated over your head and torso. Additional features include under-bed lighting, USB ports for charging your devices overnight, and adjustable legs.

Trial, Shipping, and Warranty

In addition to its affordable sticker price, the Nectar Mattress qualifies for free ground shipping anywhere in the contiguous U.S. Customers also receive a free sleep accessories bundle with their purchase, which includes a pillow, sheet set, and mattress protector. Nectar’s 365-night sleep trial is one of the longest in the online mattress industry. Owners who keep the mattress after the trial ends also receive a lifetime warranty against structural defects.

Most Comfortable: Saatva Classic

Most Comfortable

9.5/10Test Lab Score

Saatva Classic

Traditional innerspring with a plush euro-top and excellent breathability.

$300 off orders of $1,000 or more Shop At Saatva

Price: $1,795

Mattress Type: Innerspring

Firmness Options: Soft (3), Medium Firm (6), Firm (8)

Trial Period: 365 Nights ($99 return fee)

Key Details

• Who It’s Best for: People with back pain who appreciate extra support and springiness.
• Feel: Available in soft (3), medium firm (6), and firm (8) designs. All offer sturdy support and respond to movement with a strong bounce.
• What It’s Made of: Adaptive polyfoam and a memory foam lumbar pad in the comfort system, followed by transitional microcoils and robust innerspring coils.
• What We Don’t Like: Couples will notice a fair amount of motion transfer, and this can lead to sleep disruptions.

Scoring & Reviews

The following ratings show how suitable this mattress is for different sleeping positions and sleeper weights. These scores are determined by how well the mattress supports and relieves pressure for each sleeper type.

Side Sleepers

Under 130 lbs

8.5/10

130-230 lbs

9/10

Above 230 lbs

8.5/10

Back Sleepers

Under 130 lbs

9/10

130-230 lbs

8.5/10

Above 230 lbs

7.5/10

Stomach Sleepers

Under 130 lbs

9.5/10

130-230 lbs

8.5/10

Above 230 lbs

7.5/10

In addition to the hands-on feedback from our team, we conduct a number of quantitative tests in our Test Lab. The below ratings are based on the experience of our testers.

Performance

Motion Isolation6.5/10

Temperature Control10/10

Pressure Relief8/10

Edge Support8.5/10

Durability8/10

Ease of Movement8.5/10

Read Our Full Saatva Classic Review

Saatva has released many different mattresses over the years, but the flagship Classic innerspring has remained enduringly popular. A coil-on-coil design sets the Classic apart from competitors. Gentle pocketed microcoils provide transitional support by cushioning your body, while the support core contains robust low-gauge hourglass coils made from recycled steel. You’ll notice plenty of bounce when you get in and out of bed — this helps you move across the surface without feeling stuck — and the perimeter feels exceptionally sturdy.

How It Performed

Tests show the soft (3) design is ideal for side sleepers up to 230 pounds, while the firm (8) is best suited to back and stomach sleepers weighing 130 pounds or more. The medium firm (6) model should meet your needs if you’re looking for a balance of cushioning and support.

Temperature control is one area where the Saatva Classic really shines. Steady airflow through both coil layers helps ensure a comfortable interior temperature, and the breathable organic cotton cover keeps you cool on the surface. Our tests also show the Classic excels at edge support, and most of our team members had little to no trouble moving on the mattress.

Construction Breakdown

All three firmness levels share a similar comfort system featuring a Euro-top with sewn-in cushioning, wrapped in a knit cover made from organic cotton. The Plush Soft and Luxury Firm models incorporate 1.25 inches of soft polyfoam, while the Firm model uses 1.5 inches of firm polyfoam.

Below the Euro-top, layers of polyfoam and memory foam add plushness and targeted lumbar support, helping to maintain proper spinal alignment. A transitional layer of 14.5-gauge foam-encased coils adapts to the sleeper’s body while promoting strong airflow.

The support core consists of 13-gauge hourglass coils designed for durability and airflow. The mattress is available in two height options: the 11.5-inch version includes a 4-inch layer of coils, while the 14.5-inch version features a 7-inch coil layer. A thin layer of loft and fiber pads supports the coil system, while a foam encasement reinforces the mattress edges for better stability and reduced sinkage.

Trial, Shipping, and Warranty

Free White Glove Delivery and setup are available in the United States. The Saatva Classic comes with a 365-night trial. If you decide to return or replace your mattress, a $99 transportation fee will apply. The mattress is backed by a lifetime warranty.

Best for Couples: Brooklyn Bedding Signature Hybrid

Best for Couples

8.5/10Test Lab Score

Brooklyn Bedding Signature Hybrid

A high-quality, affordable hybrid with multiple firmness options.

30% off sitewide with code: JULY30 Shop At Brooklyn Bedding

Price: $1,026

Mattress Type: Hybrid

Firmness Options: Medium Soft (4), Medium Firm (6), Firm (8)

Trial Period: 120 nights (30-night requirement)

Key Details

• Who It’s Best for: Side, back, and stomach sleepers across most weight groups hoping to save some money on their new mattress.
• Feel: You can choose from cushy medium soft (4), balanced medium firm (6), and ultra-supportive firm (8) designs.
• What It’s Made of: The Signature Hybrid contains two comfort layers of adaptive polyfoam. Pocketed coils and dense base foam make up the support core.
• What We Don’t Like: Firmness exchanges are not available during the sleep trial, so nailing down the right design the first time around is key.

Scoring & Reviews

The following ratings show how suitable this mattress is for different sleeping positions and sleeper weights. These scores are determined by how well the mattress supports and relieves pressure for each sleeper type.

Side Sleepers

Under 130 lbs

8.5/10

130-230 lbs

9/10

Above 230 lbs

8.5/10

Back Sleepers

Under 130 lbs

7.5/10

130-230 lbs

7/10

Above 230 lbs

6/10

Stomach Sleepers

Under 130 lbs

7.5/10

130-230 lbs

6.5/10

Above 230 lbs

5.5/10

In addition to the hands-on feedback from our team, we conduct a number of quantitative tests in our Test Lab. The below ratings are based on the experience of our testers.

Performance

Motion Isolation7/10

Temperature Control7/10

Pressure Relief8/10

Edge Support7.5/10

Durability7.5/10

Ease of Movement6.5/10

Read Our Full Brooklyn Bedding Signature Hybrid Review

Shoppers looking for an affordable split king may want to consider the Brooklyn Bedding Signature Hybrid. Shoppers can choose between three firmness levels that share similar materials but have distinct feels. You can opt for medium soft (4), medium firm (6), or firm (8).

How It Performed

Best for Side Sleepers: Nolah Evolution 15

Best for Side Sleepers

8.7/10Test Lab Score

Nolah Evolution 15

A cloud-like experience with a plush euro-top in multiple firmnes options.

35% off sitewide + extra $50 off mattresses with code: SF50 Shop At Nolah Sleep

Price: $1,480

Mattress Type: Hybrid

Firmness Options: Medium (5), Medium Firm (6), Firm (8)

Trial Period: 120 nights (30-night requirement), $99 return pickup fee

Key Details

• Who It’s Best for: Most side and back sleepers who want pressure relief from their mattress and sleep hot.
• Feel: Sold in medium (5), medium firm (6), and firm (8) designs, all of which provide deep cushioning and targeted midsection support.
• What It’s Made of: The comfort system contains four individual layers of adaptive open-cell foam. Zoned pocketed coils with a reinforced perimeter create a strong support system.
• What We Don’t Like: Since the mattress measures 15 inches thick, you’ll need to invest in a deep-pocket fitted sheet.

Scoring & Reviews

The following ratings show how suitable this mattress is for different sleeping positions and sleeper weights. These scores are determined by how well the mattress supports and relieves pressure for each sleeper type.

Side Sleepers

Under 130 lbs

8.5/10

130-230 lbs

9/10

Above 230 lbs

8.5/10

Back Sleepers

Under 130 lbs

7.5/10

130-230 lbs

7/10

Above 230 lbs

6/10

Stomach Sleepers

Under 130 lbs

7.5/10

130-230 lbs

6.5/10

Above 230 lbs

5.5/10

In addition to the hands-on feedback from our team, we conduct a number of quantitative tests in our Test Lab. The below ratings are based on the experience of our testers.

Performance

Motion Isolation7.5/10

Temperature Control7/10

Pressure Relief8.5/10

Edge Support8.5/10

Durability7.5/10

Ease of Movement6.5/10

Read Our Full Nolah Evolution 15 Review

Full Breakdown

The Nolah Evolution 15 is a luxury Euro-top hybrid available in three firmness levels to accommodate different weights and sleep positions. A sophisticated design with a balance of contouring and support makes the mattress a good option for adjustable owners seeking a split king.

How It Performed

The Evolution 15 earns high marks for temperature neutrality thanks to its breathable foams and steady airflow throughout the coil system. The perimeter coils are also reinforced to minimize sinkage when you sleep near the edges or get in and out of bed. This push-back makes the mattress easy to move across for most people.

The medium (5) feel offers the closest contouring and cushioning, making it best suited to side and back sleepers who weigh up to 230 pounds. The firm (8) feel is most supportive, so back and stomach sleepers who weigh more than 230 pounds will probably prefer this option instead. The medium firm (6) feel is most balanced, and should be comfortable for anyone in the range of 130 to 230 pounds regardless of their primary sleep position.

Construction Breakdown

Under a foam-padded Euro-top, the Evolution 15 is constructed with two layers of adaptive foam that distribute your weight and target pressure points along the spine. These foams are also designed to absorb a minimal amount of body heat and help you stay cool during the night, even if you tend to run warm in bed. A cover made of proprietary ArcticTex fabric provides additional cooling.

The support core contains pocketed coils to stabilize and reinforce the mattress without creating too much motion transfer or making the surface feel excessively stiff. This layer is divided into different zones based on coil gauge, with the thickest coils located beneath your midsection to prevent uncomfortable sinkage.

Trial, Shipping, & Warranty

Nolah offers free ground shipping throughout the contiguous U.S. The Evolution 15 comes with a 120-night sleep trial, though customers may forgo the trial period to lower the cost of their order – though this disqualifies them from returning the mattress at any point. All purchases also include a lifetime warranty against structural defects.

 

The Nolah Evolution 15 is a luxury Euro-top hybrid available in three firmness levels to accommodate different weights and sleep positions. A sophisticated design with a balance of contouring and support makes the mattress a good option for adjustable owners seeking a split king.

How It Performed

Best for Back Pain: Bear Elite Hybrid

Best for Back Pain

8.5/10Test Lab Score

Bear Elite Hybrid

A close-conforming memory foam hybrid offering great pressure relief.

40% sitewide with code: SF40 Shop At Bear

Price: $1,499

Mattress Type: Hybrid

Firmness Options: Medium (5), Medium Firm (6), Firm (8)

Trial Period: 120 nights (30-night break-in period)

Key Details

• Who It’s Best for: People with shoulder, back, or hip pain across most position and weight groups.
• Feel: You can choose from medium (5), medium firm (6), and firm (8) designs, all with targeted support for the torso and hips.
• What It’s Made of: A memory foam comfort layer and zoned transitional polyfoam, followed by seven-zone pocketed coils with a reinforced perimeter.
• What We Don’t Like: Some couples report motion transfer in response to movement – even on the softest design.

Scoring & Reviews

The following ratings show how suitable this mattress is for different sleeping positions and sleeper weights. These scores are determined by how well the mattress supports and relieves pressure for each sleeper type.

Side Sleepers

Under 130 lbs

8.5/10

130-230 lbs

9/10

Above 230 lbs

8.5/10

Back Sleepers

Under 130 lbs

7.5/10

130-230 lbs

7/10

Above 230 lbs

6/10

Stomach Sleepers

Under 130 lbs

7.5/10

130-230 lbs

6.5/10

Above 230 lbs

5.5/10

In addition to the hands-on feedback from our team, we conduct a number of quantitative tests in our Test Lab. The below ratings are based on the experience of our testers.

Performance

Motion Isolation7/10

Temperature Control7/10

Pressure Relief8/10

Edge Support7.5/10

Durability7.5/10

Ease of Movement6.5/10

Read Our Full Bear Elite Hybrid Review

Bear has earned a reputation for mattresses and other sleep products that deliver exceptional cooling. The Elite Hybrid is no exception. A cover made from breathable Celliant-blend fabric, copper-infused memory foam, and steady air circulation through the coil layer allow you and your partner to sleep at a comfortable temperature throughout the year. Co-sleepers should also enjoy the Elite Hybrid for its strong edge support and good responsiveness for sex.

How It Performed

Best for Combination Sleepers: DLX Premier Hybrid

Best for Combination Sleepers

8.6/10Test Lab Score

DLX Premier Hybrid

Versatile hybrid with six differet firmness options.

$500 off select mattresses + $100 off with code: SLEEP Shop At DLX Mattress

Price: $1,700

Mattress Type: Hybrid

Firmness Options: Medium Soft (4), Medium Firm (6), Firm (8)

Trial Period: 120 nights (30-night requirement)

Key Details

• Who It’s Best For: Couples with differing firmness preferences, people with back pain, couples, and hot sleepers.
• Feel: Available in split-firmness designs with a different feel on each side. Firmness options include medium soft (4), medium firm (6), and firm (8).
• What It’s Made Of: A comfort system with three adaptive foam layers over pocketed coils with perimeter reinforcement and high-density base foam.
• What We Don’t Like: A standard split king with uniform firmness across the entire surface is not available.

Scoring & Reviews

The following ratings show how suitable this mattress is for different sleeping positions and sleeper weights. These scores are determined by how well the mattress supports and relieves pressure for each sleeper type.

Side Sleepers

Under 130 lbs

8.5/10

130-230 lbs

9/10

Above 230 lbs

8.5/10

Back Sleepers

Under 130 lbs

7.5/10

130-230 lbs

7/10

Above 230 lbs

6/10

Stomach Sleepers

Under 130 lbs

7.5/10

130-230 lbs

6.5/10

Above 230 lbs

5.5/10

In addition to the hands-on feedback from our team, we conduct a number of quantitative tests in our Test Lab. The below ratings are based on the experience of our testers.

Performance

Motion Isolation7/10

Temperature Control7/10

Pressure Relief8/10

Edge Support8.5/10

Durability7.5/10

Ease of Movement6.5/10

At SleepFoundation.org, we always encourage readers to take their sleep position into account when choosing a new mattress. This can be especially tricky for a combination sleeper who shuffles between two or three positions each night. The DLX Premier Hybrid earns our recommendation thanks in large part to its versatility. Three firmness options, as well as the dual-firmness design for split king models, help ensure the mattress meets the needs of most people across different body types and sleep positions.

How It Performed

What Is a Split King Mattress?

A split king mattress is, as the name states, a king mattress that is split down the middle to form two separate mattresses. When put together, the dimensions are approximately 76 inches by 80 inches, which is the same as a traditional king. Apart, each mattress is a twin XL: 38 inches by 80 inches.

Why Would You Need a Split King?

Split king mattresses are most often used by couples because partners don’t always have the same sleeping needs. Body size, sleeping position, and personal preference affect what feels comfortable. A split king allows each partner to choose their own distinct sleep surface while still sharing a bed.

“Compromising on the type of bed can mean sacrificing critical elements of sleep health. A poorly suited mattress may lead to restless nights, chronic pain or exacerbated posture issues by failing to support the body’s natural curves.”

Lulu Guo, MD

Sleep Medicine Physician

Differing Firmness Needs

Body weight and sleeping position are two of the biggest factors when choosing an appropriate firmness level. Couples’ needs can vary widely in this regard. For instance, a stomach sleeper over 230 pounds is likely to need a much firmer mattress than their partner who weighs under 130 pounds and sleeps on their side.

Motion Isolation

When a person tosses and turns or gets out of bed, vibrations may travel across the mattress surface and disturb their partner. Since a split king is two separate pieces, movement on one side of the bed does not transfer to the other.

For Use on an Adjustable Base

Sleepers may use an adjustable base for a wide variety of reasons, including comfort and helping to prevent snoring and acid reflux. Combining an adjustable base with a split king allows each partner to customize the position of their bed.

“Elevating the head of the bed by 20 to 45 degrees can significantly alleviate snoring and acid reflux symptoms by leveraging gravity to optimize body positioning,” says sleep medicine physician Lulu Guo, M.D. “For acid reflux, this incline prevents stomach acid from flowing back into the esophagus, reducing nighttime heartburn. For snorers, it helps keep airways open by minimizing the collapse of throat tissue and tongue obstruction.”

How to Choose the Best Split King Mattress

Picking the right split king mattress is much like choosing any other size but with a few additional considerations. If you’re purchasing a mattress to share with your partner, their preferences are also important to consider. You may want to reflect on your available floor space, decide what’s within your budget, and ensure that a split king will work with the bed frame you have in mind.

Typically, your body weight and sleeping position have the biggest impacts on what you’ll prefer. First, narrow down your choices to models with the right level of support and comfort. Once you know if a mattress will meet your basic needs, then look at its additional features.

Firmness Level

Firmness affects comfort, and the ideal level depends on your body type, sleep position, and personal preferences. To compare firmness, we rate it on a scale from 1 to 10. Lower numbers indicate a softer surface, while higher numbers are firmer. The majority of sleepers prefer a model between medium (5) and firm (7). Couples often select a different firmness for each side of their split king to more closely match their preferences.

Pressure Relief and Contouring

Many sleepers develop pressure points from resting on the same parts of their bodies for long periods. A mattress that relieves pressure well redistributes weight and provides cushioning beneath parts of the body prone to pressure points like the hips and shoulders.

Some sleepers like the feel of a mattress that contours closely. This cradling can relieve pressure while supporting the spine. However, others find it restricts movement. Consider whether you prefer the feeling of sleeping “on” or “in” a mattress to determine what level of contouring you’d prefer.

Firmness level also contributes to pressure relief and contouring, so if you choose a split king with a different firmness on each side, you can also achieve more or less contouring. In general, a softer mattress will have more contouring and a firmer will have less, though much depends on the specific materials used.

Sleeping Position

Sleeping position is one of the most important considerations when choosing a mattress. Typically, side sleepers enjoy softer mattresses, stomach sleepers prefer firmer, and back sleepers generally fall in the middle. Combination sleepers may want to consider mattresses that perform well across positions for their weight group. 

“Split king beds can offer tailored sleep comfort based on individual sleeping positions,” Dr. Guo says. “One partner can opt for a softer mattress if they are side sleepers to cushion the hips and shoulders, whereas back or stomach sleepers can choose a firmer mattress to maintain spinal alignment.”

Price

Split king prices can run the gamut, depending on their materials, but they tend to be more expensive than traditional kings or California kings. Because they’re two separate mattresses, manufacturers use more materials to build them than they would to create a single king bed. Split king foundations are also generally more expensive for the same reason.

Manufacturers also differ in how they list prices. Some provide the cost of both sides together, and others sell them separately as twin XLs. Note how the price is listed before purchasing. To save some money, look for mattress deals around federal holidays.

Quality Materials

Not all mattress materials are equal, and price point isn’t always an indicator of quality. Poorly manufactured components may break down more quickly, potentially limiting the mattress’ lifespan. High-quality materials often increase the cost of a mattress, but it may ultimately be more affordable to pay extra upfront rather than regularly replacing lower quality models.

Motion Isolation

A mattress that isolates motion absorbs vibrations to prevent them from moving across the surface. Motion isolation can be invaluable for sleepers who share a bed. Split king mattresses isolate motion exceptionally well because they consist of two separate pieces. 

“This can be a strategic solution for sleepers who need to get up frequently throughout the night so as to not disturb their partners,” Dr. Guo says.

Temperature Regulation

Body heat can build up while you sleep, and some people are more sensitive to excess warmth. Mattresses that regulate temperatures well often have good airflow, foam infused with cooling technology, or fabric designed to wick away heat and moisture. Innerspring and hybrid mattresses tend to sleep cooler than all-foam models because they trap less heat within their cores.

Edge Support

Edge support can be valuable for individuals who struggle to get into and out of bed and those who need the entire mattress surface. Since each side of a split king mattress is just 38 inches wide, a sturdy perimeter may be especially important. However, edge reinforcement could also affect the feel of the area where the two pieces meet.

“Split kings can offer couples individualized comfort over a one-size-fits-all approach,” Dr. Guo says. “By addressing disparities in firmness, motion, temperature and medical requirements, it fosters better sleep harmony and overall well-being.”

Warranty and Other Policies

Warranty, shipping, and trial policies vary widely between mattress manufacturers. Check to see what a mattress warranty covers and for how long. Even if the mattress has lifetime coverage, examine what defects qualify, whether the policy is prorated, what exclusions apply, and what’s required of the owner.

Though many companies offer free shipping, there are often restrictions or additional charges for orders to P.O. boxes, Hawaii, Alaska, and Canada.

Some sleep trials may truly be risk-free, but others charge restocking, disposal, or transportation fees for returns. Companies also frequently allow just one trial per household, and many require that the unwanted mattress remains in excellent condition. Review all the fine print before committing to a mattress purchase.

What Type of Split King Mattress Is Best?

Hybrid, innerspring, foam, latex, and airbed models are all excellent options for a split king, though each has potential pros and cons.

Hybrid

Definition:Hybrid mattresses combine the best features of innerspring and all-foam mattresses, while minimizing the drawbacks of each. They consist of a pocketed coil-based support core topped by a substantial comfort system. The comfort system may feature latex, memory foam, or a combination of the two.

Highlight: Hybrids typically offer superior contouring and pressure relief, making them a good fit for side sleepers, and their coil base provides nice pushback and support. There are several split king hybrids available in a variety of firmness levels. 

Foam

Definition: Foam mattresses feature layers of different types of foam in various configurations. Comfort layers are usually made from memory foam or soft polyfoam. Instead of pocketed coils, they rely on a strong polyfoam core for support.

Highlight: Memory foam offers deep contouring and soothing pressure relief, so they’re great for side sleepers or anyone who likes to feel hugged by their mattress. The flexibility of foam mattresses makes them an ideal option if you’re looking to pair a split king with an adjustable bed frame. 

Innerspring

Definition: Innersprings were once the most common mattress type, though they’ve been overtaken by more comfortable options in recent years. Innersprings feature a coil core and a fabric cover, with little or no comfort or transitional system. 

Highlight: Innerspring mattresses remain an affordable option and also tend to sleep cool. It’s more common these days to find hybrid models in a split king than a true innerspring. 

Latex

Definition: Latex beds are made from layers of natural or synthetic latex rubber, though natural is more common. Natural latex is derived from rubber tree sap and processed using either the Talalay or Dunlap methods. Talalay latex typically creates a lighter and softer mattress, while Dunlap latex tends to be firmer and more durable.

Highlight: Latex has the ability to distribute weight over a larger area so it contours gently without too much give or sink. Split king latex models aren’t as common as other types, but they are available if you prefer the feel of latex.

Airbed

Definition: The bulk of an airbed consists of multiple air-filled chambers, which may be filled or deflated to the sleeper’s liking with a built-in pump. The pump is often controlled by a smartphone app or remote control. Airbeds may also feature extra padding on top with materials like foam or latex.

Highlight:Airbeds allow users to customize their sleep experience by changing the firmness level with the push of a button. Many airbeds are available as split kings allowing for full adjustability for you and your partner.

How We Test: Your Comfort Is Our Science

Our industry-leading product testing team cares deeply about improving your sleep. Having a holistic understanding of a mattress’s role as part of a sleep system is paramount to our testing process. Since a bed’s comfort and feel depend largely on body weight and sleeping position, our testing team represents a wide range of body types, sleep positions, and comfort preferences.

In our Seattle-based Test Lab, we use an objective, hands-on process to evaluate mattresses across performance categories. The following are the key guidelines that inform our performance ratings. Our ultimate goal is to ensure you have all the information you need to make the best purchase decision for you.

How We Determine Our Overall Scores

To determine a mattress’s overall score, we assign weighted percentages to performance categories based on how important they are to the individual sleep experience. For instance, areas like pressure relief and temperature control tend to matter more to people than something like off-gassing, and because more people sleep on their side and back than on their stomach, we weigh those positions more heavily.

Dive Deeper – Mattress Guides by Size

If you’re still not sure if a split king mattress is right for you and your partner, you can take a look at our other mattress guides broken down by size.

Still have questions?

Our product experts have extensive experience testing just about every sleep product on the market.

Send an email to AskAnExpert@sleepfoundation.org with your questions and we’ll help you find exactly what you’re looking for.