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The split king is a simple solution to age-old problems that often arise when sharing a bed. This style gives each partner their own sleeping area by placing two separate mattresses next to each other, which can be invaluable for couples. Sleepers who change positions throughout the night don’t have to worry about motion transfer disturbing their partners. What’s more, couples with different firmness preferences each select a surface that meets their needs.

We’ll review our picks for the best split king mattresses on the market, examining their materials, performance, and value. Additionally, we’ll cover what to look for when shopping for a split king to help you make an informed decision between models.

Product Details

Best Overall


Brand Logo
Mattress Type: Innerspring
Firmness: Medium Soft (4), Medium Firm (6), Firm (7), Firm (8)
Trial Length: 120 nights (30 night requirement)
Warranty: Lifetime, Limited
Sizes: Twin, Twin XL, Full, Queen, King, California King

Who it’s best for:

  • Hot sleepers
  • People who carry extra weight in their shoulders and hips
  • Shoppers who aren’t sure which mattress firmness is best for them


  • Adaptive comfort system contours evenly without sinking too much
  • Zoned coils reinforce the midsection and push back against perimeter sinkage
  • Available in four firmness levels

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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.

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.

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.

While the WinkBed isn’t available in a dedicated split king size, you can order two twin XL models. This allows you and your partner to choose different firmness levels if your preferences don’t match. WinkBeds’ initial sleep trial runs for 120 nights. If you decide to exchange either twin XL mattress 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.

Read our Full WinkBed Review to learn more

Best Value

Nectar Mattress

Brand Logo
Mattress Type: Foam
Firmness: Medium Firm (6)
Trial Length: 365 nights
Warranty: Lifetime, Limited
Sizes: Twin, Twin XL, Full, Queen, King, California King, Split King

Who it’s best for:

  • Side and back sleepers
  • People who are easily awakened by their sleep partner's movements in bed
  • Shoppers with limited budgets


  • Medium firm all-foam design offers a balance of cushioning, contouring, and support
  • Excellent motion isolation for couples
  • All orders include a year-long sleep trial with free returns

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The Nectar is proof that a high-quality, split king memory foam mattress doesn’t need to break the bank. Priced well below average for this mattress type, the Nectar features a thick memory foam comfort layer that cushions and adapts to your body. The medium firm (6) feel and dense support layers help ensure even weight distribution and limited sinkage beneath the midsection, making this mattress a good choice for people who normally find all-foam beds too soft.

Above-average cooling is another strength of the Nectar Mattress. The memory foam is infused with cooling gel intended to dissipate – rather than trap – body heat, while the breathable cover is made of a polyester, polyethylene, and nylon with cooling and moisture-wicking properties. All three foam layers absorb movement and significantly reduce motion transfer across the surface, so you and your partner won’t have your sleep disturbed when the other person changes positions or gets up in the middle of the night.

During our tests, the Nectar earned favorable ratings from side sleepers across all weight groups. These testers received ample cushioning around the shoulders and hips, two areas of frequent pressure buildup for sleepers who primarily use the side position. Back sleepers weighing up to 230 pounds were able to lie on the Nectar without sinking too much beneath the midsection. Stomach sleepers up to 230 pounds also felt comfortable on the mattress.

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.

Read our Full Nectar Mattress Review to learn more

Best Luxury


Brand Logo
Mattress Type: Airbed
Firmness: Adjustable – Soft (3) to Firm (8)
Trial Length: 365 Nights ($99 Return Fee)
Warranty: Lifetime, Limited
Sizes: Twin XL, Full, Queen, King, California King, Split California King, Upperflex Queen, Upperflex King

Who it’s best for:

  • Sleepers with changing firmness preferences
  • Hot sleepers
  • Those who value responsive pressure relief


  • 50 firmness settings
  • Latex and memory foam comfort system combines contouring and buoyancy
  • Separate air chambers with controls for each side of the bed

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The Saatva Solaire is a highly versatile airbed with enough customizable options to satisfy a wide range of sleepers. The model has 50 firmness settings, allowing each partner to fine-tune their sleep surface. Dual controls come with queen and king sizes, including the split king option. Though this model’s price-point is higher than many traditional mattresses, the added cost may be worth it for couples with different firmness preferences and individuals who want a highly adaptable mattress.

While the Solaire is an airbed, it also has a comfort system atop the fillable air chambers to enhance its contouring and support. Its construction begins with a 3-inch Euro-top that gives the surface a plush feel.

Beneath that rests a layer of natural Talalay latex for responsive pressure relief. The latex is zoned with greater firmness under the lower back for even spinal support. A memory foam layer contours deeply, and a gel infusion is engineered to help draw heat away from the sleeper. A moisture barrier separates the comfort system from the core to prevent mechanical issues.

As an airbed, the Solaire’s support core consists of air chambers that inflate and deflate to create different firmness levels. Each sleeper can control their settings at the push of a button. Saatva has designed this model to perform quietly and discreetly. The core is reinforced at the perimeter to enhance the edge support.

Unsurprisingly, the Solaire’s versatility helps it excel in many testing categories, including pressure relief, temperature control, and durability. People with different position preferences and weights find this model comfortable since the firmness level ranges from soft (3) to firm (8).

Saatva backs the Solaire with a lifetime warranty and a 365-night sleep trial. Those wishing to return their mattress during their trial will receive a refund less a $99 transport fee. Shoppers in the contiguous U.S. enjoy free White Glove delivery.

Read our Full Solaire Review to learn more
Proprietary photo of the Helix Midnight in the SleepFoundation testing lab

Best for Couples

Helix Midnight

Brand Logo
Mattress Type: Hybrid
Firmness: Medium Firm (6)
Trial Length: 100 nights (30-night requirement)
Warranty: 10 Year, Limited
Sizes: Twin, Twin XL, Full, Queen, King, California King

Who it’s best for:

  • Hot sleepers who like the feel of memory foam
  • Side sleepers
  • Couples


  • Adaptive foam layers isolate most movement transfer
  • Memory foam top layer closely contours to the body to relieve pressure
  • Perimeter reinforcement limits sinkage when you get in and out of bed

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Many couples can experience sleep disturbances from their partner’s movement at night. The Helix Midnight’s thick foam comfort system combats this issue, absorbing most movement transfer and noise. Meanwhile, the coil system offers decent bounce that couples may enjoy for amorous activities.

The Midnight’s comfort system begins with an adaptive memory foam layer that reduces pressure buildup. Underneath is a polyfoam transitional layer that acts as a buffer between your body and the coils. The support core features pocketed coils that prevent uncomfortable sagging. Meanwhile, a perimeter reinforcement makes the mattress feel stable when you sleep near the edges or get in and out of bed.

The Helix Midnight is specifically geared toward side sleepers weighing up to 230 pounds, thanks to the adaptive foam layers and the supportive medium firm (6) feel. Our side-sleeping testers noted significant contouring for their sore shoulders and hips without sinking excessively. Back sleepers weighing up to 230 pounds also found the mattress supportive and comfortable, but stomach sleepers and those weighing more than 230 pounds may sink too deeply. Steady airflow through the coils earned the Midnight higher-than-average ratings in our temperature control tests compared to other mattresses with foam layers. This makes it a great choice if you’re a hot sleeper who likes the feel of memory foam.

Please note that the Midnight is not available in a traditional split king size. Instead, you can purchase two twin XL models, which is essentially the same as a split king order. The Midnight is one of the company’s more affordable models, and shipping is free to all 50 states. Each purchase is backed by a 100-night sleep trial and a 10-year warranty.

Read our Full Helix Midnight Review to learn more
A picture of the DreamCloud Mattress in Sleep Foundation's test lab.

Most Comfortable

DreamCloud Mattress

Brand Logo
Price Range: $799 – $1,499
Mattress Type: Hybrid
Firmness: Medium Firm (6)
Trial Length: 365 nights (30-night requirement)
Warranty: Lifetime, limited
Sizes: Twin, Twin XL, Full, Queen, King, California King

Who it’s best for:

  • People who weigh 130 to 230 pounds
  • Those who are prone to night sweats
  • Shoppers looking for a mattress with a lengthy trial period


  • Ultra-comfy combo of plush, adaptive foam layers and robust pocketed coils
  • Cashmere-blend cover maintains a cool surface and wicks away moisture
  • Each order includes a 365-night trial period

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Although comfort is a subjective quality, some mattresses nail down the balance of cushioning and support better than others. The DreamCloud is one such mattress. This luxury hybrid contains a deep comfort system cushioned with adaptive foam, giving the surface a soothingly plush feel when you get into bed. Since each layer is progressively denser, you’ll feel a bit of pushback as your body settles. Sturdy pocketed coils add further reinforcement, ultimately giving the mattress a medium firm (6) feel despite the close initial contouring.

Our testers were by and large impressed with the DreamCloud. The mattress received favorable ratings from our team across most body types and sleep positions, with the most praise coming from side sleepers of at least 130 pounds, and back and stomach sleepers weighing 130 to 230 pounds. We also found the thick foam layers absorb movement well, making the DreamCloud a good option for couples — especially those who normally find hybrids too bouncy and disruptive to sleep.

Temperature control was another testing highlight, as our thermal imaging technology revealed minimal heat buildup. We’ve attributed this to steady airflow through the coil system and the cover, which is made from a breathable, moisture-wicking cashmere blend. Both components effectively offset any heat retention from the foam layers — you may notice a little warmth beneath the surface, but we don’t expect anyone to sleep excessively hot on the mattress.

The DreamCloud’s sticker price in a split king size falls well below average for a hybrid model and shipping is free for customers in the contiguous U.S. Your order comes with a generous sleep trial spanning an entire year, ensuring ample time to test out the mattress and decide whether it meets your needs. DreamCloud backs each purchase with a lifetime warranty for added peace of mind.

Read our Full DreamCloud Mattress Review to learn more
A picture of the Brooklyn Bedding Signature Hybrid in Sleep Foundation's test lab.

Best for Adjustable Beds

Brooklyn Bedding Signature Hybrid

Brand Logo
Mattress Type: Hybrid
Firmness: Medium Soft (4), Medium Firm (6), Firm (8)
Trial Length: 120 nights (30-night requirement)
Warranty: 10 Year, Limited
Sizes: Twin, Twin XL, Full, Queen, King, California King, Custom Sizes

Who it’s best for:

  • Value seekers
  • People who experience pressure points
  • Hot sleepers


  • Available in three firmness levels
  • Individually wrapped coils move independently to reduce motion transfer
  • Priced competitively

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Shoppers looking for an affordable split king may want to consider the Brooklyn Bedding Signature Hybrid. This hybrid model has multiple luxury features without the premium price tag. 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), though Brooklyn Bedding includes a generous sleep trial in case your first choice isn’t ideal.

Exact specifications vary slightly between firmness options, but all three share the same basic comfort system materials. The surface has a quilted top designed to resist body impressions. Beneath that, a layer of patented TitanFlex polyfoam is engineered to adapt to your body’s movements throughout the night. VariFlex, another proprietary polyfoam, relieves pressure points by compressing deeply.

The support core contains 8 inches of pocketed coils that are individually wrapped to minimize how much motion transfers across the mattress’ surface. Higher-caliber coils at the perimeter give this model extra support around the edges. A thin polyfoam layer provides a stable base that helps reinforce the support core.

People who weigh more than 230 pounds are likely to prefer the robust support of the firm, the medium firm is well suited to those who weigh between 130 pounds and 230 pounds, and those under 130 pounds should enjoy the plush feel and pressure relief of the medium soft version. Each model relieves pressure and regulates temperatures well, especially considering the mattress’ price-point.

The Signature Hybrid carries a 10-year limited warranty and purchases within the contiguous U.S. include free shipping and a 120-night trial.

Read our Full Brooklyn Bedding Signature Hybrid Review to learn more
product image of the nest bedding owl

Best Pressure Relief

Nest Bedding Owl

Brand Logo
Mattress Type: Hybrid
Firmness: Soft (3), Medium (5), Firm (7)
Trial Length: 365 nights
Warranty: Lifetime, Limited
Sizes: Twin, Twin XL, Full, Queen, King, Split King, California King, Split California King

Who it’s best for:

  • Couples with differing firmness preferences
  • Hot sleepers
  • Shoppers looking for a mattress with a lengthy trial period


  • Multiple firmness options with dual-firmness for king sizes
  • Foam-and-latex comfort system cushions the body without sinking too much
  • Perimeter coils are reinforced to stabilize the edges

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If you wake up feeling sore or stiff, your mattress may be partially to blame — a sleep surface that feels too soft or too firm can create pressure buildup in the shoulders, hips, and other sensitive areas along the spine. The Nest Bedding Owl is available in soft (3), medium (5), and firm (7) designs. If you and your partner need a different firmness level to sleep comfortably, you can each order a twin XL Owl model for your split king frame. You can also order a traditional king with a different firmness on each side.

The Owl is constructed with a top layer of organic cotton and wool batting quilted to the bottom of the cover. These materials act as a natural fire barrier, and also wick moisture away from your body to keep you dry on humid nights. Comfort layers of adaptive polyfoam and Dunlop latex provide a balance of cushioning and pushback, so you’ll feel some contouring without excessive sinkage. The support core contains pocketed coils over a layer of dense base foam. Thicker coins stabilize the perimeter, allowing you to get in and out of bed with relative ease.

Our team tested each of the Owl’s firmness options. Side sleepers up to 230 pounds preferred the soft feel, but this design did not provide enough support for our other testers. The medium feel was best suited to our back sleepers up to 230 pounds and stomach sleepers under 130 pounds, whereas the firm feel felt most comfortable to side sleepers over 230 pounds, and back and stomach sleepers between 130 and 230 pounds. 

Our tests also show the mattress sleeps exceptionally cool due to limited heat absorption in the comfort system and steady airflow through the coils. With firmer models, the latex provides enough bounce to help you move across the surface without sinkage or resistance. The soft and medium designs earned our highest marks for pressure relief, and the former also performed well during our motion isolation tests despite the responsive latex layer.

In addition to split and dual-firmness king models, you can also order a split California king Owl if you want more length and less width than a traditional king. Nest Bedding offers free ground shipping throughout the contiguous U.S. The company’s 365-night sleep trial is among the longest in the online mattress industry, allowing you to test the mattress up to one year. You may also exchange your mattress for free during this time frame if you aren’t satisfied with your initial firmness selection. Those who choose to keep the mattress also receive a lifetime warranty against manufacturing defects.

A picture of the Nolah Evolution 15 Mattress in Sleep Foundation's test lab.

Best for Side Sleepers

Nolah Evolution 15

Brand Logo
Mattress Type: Hybrid
Firmness: Medium (5), Medium Firm (6), Firm (8)
Trial Length: 120 nights (30-night requirement)
Warranty: Lifetime, Limited
Sizes: Twin, Twin XL, Full, Queen, King, California King, Split King

Who it’s best for:

  • Hot sleepers
  • People who struggle getting in and out of bed
  • Shoppers who don't require a sleep trial


  • Available in three different firmness levels
  • Zoned coil system provides extra reinforcement for heavy areas of the body and limits sinkage along the edges
  • Engineered for cooling and temperature control

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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.

In addition to the 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.

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.

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.

Read our Full Nolah Evolution 15 Review to learn more
A picture of the Bear Elite Hybrid Mattress in Sleep Foundation's test lab.

Best for Back Pain

Bear Elite Hybrid

Brand Logo
Mattress Type: Hybrid
Firmness: Medium (5), Medium Firm (6), Firm (8)
Trial Length: 120 nights (30-night break-in period)
Warranty: Lifetime warranty
Sizes: Twin, Twin XL, Full, Queen, King, California King, Split King

Who it’s best for:

  • Those who carry extra weight in their chest, stomach, and hips
  • Hot sleepers
  • People who have a hard time getting in and out of bed


  • Premium hybrid design combines cushioning foam layers and a robust coil system
  • Customers can choose between three firmness levels ranging from medium to firm
  • Cooling cover and steady airflow ensure excellent temperature control

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Bear has earned a reputation for mattresses and other sleep products that deliver exceptional cooling. The Elite Hybrid – Bear’s newest mattress model – 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.

Another standout feature of the Elite Hybrid is its polyfoam transitional layer, which is divided into five firmness zones. This ensures most sleepers won’t experience deep sinkage around the torso and hips – areas where people tend to carry a disproportionate amount of weight – while the foam gently cradles the head, shoulders, and legs. In the support core, thicker coils along the perimeter minimize sinkage. This allows you and your partner to use the entire surface of the mattress for sleep or sex.

The mattress is available in three firmness levels. During our hands-on tests, the medium (5) design earned favorable ratings from side and back sleepers weighing up to 230 pounds. This model closely contours and cradles the spine, alleviating pressure in the process. Those who need slightly more support should opt for the medium firm (6) design. Our side sleepers between 130 and 230 pounds and back sleepers weighing up to 230 pounds found this model comfortable and supportive in equal measure. For people who weigh more than 230 pounds, the firm (8) design should provide adequate reinforcement.

Bear offers free standard delivery throughout the contiguous U.S. Each order comes with two free pillows, but customers can also pay a small upcharge and receive a sleep accessories bundle that includes two pillows, a sheet set, and a mattress protector. The Elite Hybrid comes with a 120-night sleep trial, and those who keep their mattress also receive a lifetime warranty against structural defects.

Read our Full Bear Elite Hybrid Review to learn more

Why You Should Trust Us

Finding the best spilt king mattress can feel like a never-ending chore because of the sheer volume of available models. The team of sleep product experts at Sleep Foundation has tried and tested hundreds of mattresses to give our readers the most thorough list possible. Our testing team includes people with varying body types and position preferences to better reflect how different individuals may experience the same model.

Each mattress goes through a series of rigorous tests to rate it on multiple performance metrics, including pressure relief, temperature control, and more. We use a consistent methodology that incorporates qualitative feedback and quantitative measures, such as body-mapping technology and thermal imaging. We also try to gauge how a mattress will perform across all available sizes, which can be important when choosing a less popular option, like split king.

Other Mattress Guides

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.

What is a Split King Mattress?

A split king mattress is exactly as it sounds: 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. We’ll examine the pros and cons of split king mattresses as well as discuss who might prefer this option.

Why Would You Need a Split King?

Split king mattresses are most often used by couples. Partners don’t always have the same sleeping needs. Body size, 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.

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, mitigating snoring, and preventing acid reflux. Combining an adjustable base with a split king allows each partner to customize the position of their bed.

How to Choose a 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.

What to Look For in a Mattress

When mattress shopping, it’s critical to consider your sleep habits. Instead of getting caught by flashy features or marketing jargon, consider whether the basic functions line up with what you need.

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.


Split king mattresses are one of the most expensive sizes, generally carrying higher price tags than traditional or California kings. To save some money, look for mattress deals around federal holidays.

Manufacturers 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.

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.

Quality Materials

Not all mattress materials are equivalent, 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.

Firmness Level

Firmness affects comfort. 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 individual preferences.

Pressure Relief

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 pressure-prone body parts.

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.

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.


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.

Mattress Type

Hybrid, innerspring, foam, latex, and airbed models are all excellent options, though each has potential pros and cons. Airbeds are often ideal for those who want to adjust the firmness of the surface. Sleepers who prefer a traditional feel may opt for an innerspring model. Eco-conscious shoppers frequently like natural latex, and individuals who prioritize conforming often favor all-foam options. Hybrids can be an excellent choice for sleepers looking for a mixture of qualities.

Last Things to Consider with a Split King Mattress

Once you’ve got your eye on a split king mattress, it’s time to consider whether it’s a good fit for your home and lifestyle. We’ll highlight a few additional items to assess before hitting “add to cart.”

Split or Single King Foundation

Sleepers who opt for a split king can use a single-piece king foundation or a split foundation. Single-piece foundations can be heavy and tough to move from room to room. People prioritizing maneuverability may prefer a split foundation. Both sides can be moved independently from one another, but they can be placed side-by-side on a king size bed frame.

Luxury Features on Adjustable Beds

Shoppers often use split king mattresses on adjustable beds. Many adjustable beds come with features that may not be necessary but could be welcome additions. Massage features, temperature controls, and memory settings can all increase the cost. However, they may be worth it for sleepers who want an especially luxurious feel.

Mattress Warranty and Other Policies

Warranty, shipping, and trial policies vary widely between mattress manufacturers. Though many appear generous, there can be limitations or fees hidden in the fine print.

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.

Frequently Asked Questions About Split King Mattresses

What type of sheets fits a split king mattress?

Split king mattresses require two twin XL fitted sheets and a single king size top sheet. Though the two twin XLs have the same dimensions as a king when pushed together, many sleepers find it cumbersome to stretch a king fitted sheet across both mattresses. Sleepers also generally opt for a king size comforter.

Is a split king the same as two twin XL mattresses?

At its most basic level, a split king is two twin XL mattresses set next to each other. They can share the same single-piece foundation or sleepers can choose the versatility of a split king foundation or a split adjustable base.

While many manufacturers sell split kings, shoppers can also purchase two twin XL mattresses separately to achieve the same effect. This can allow couples with different preferences to mix and match different firmnesses or models.

What type of mattress can you use with a split king adjustable bed?

Most types of mattresses are compatible with split king adjustable beds, with the exception of some innersprings. Sleepers looking for maximum adjustability may want to opt for a foam mattress since it bends and conforms more easily. Some manufacturers also make adjustable frames designed to work seamlessly with their mattress models.

How much does a split king mattress cost?

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.

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