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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.

Want to learn more about our top mattress picks? Visit our guide to the best overall mattresses of 2024 for details about our strongest performers. You can also check out our list of the best mattresses for side sleepers and other guides based on your specific needs.

The Best Mattress Deals of the Week

In-Depth Reviews

The WinkBed is one of the most evenly balanced mattresses our team has tested, with quilted foam on top and sturdy coils on the bottom. You can pick from four firmness options to ensure the best match.

  • Pros

    1. Adaptive comfort system contours evenly without sinking too much

    2. Zoned coils reinforce the midsection and push back against perimeter sinkage

    3. Available in four firmness levels

  • Cons

    1. Coils may produce noticeable motion transfer

    2. Foam might initially off-gas

Mattress Type

Innerspring

Firmness Options

Medium Soft (4), Medium Firm (6), Firm (7), Firm (8)

Trial Period

120 nights (30 night requirement)

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.

The Nectar Adjustable Bundle offers great savings if you are in the market for a new mattress and sleep accessory set. Your purchase also includes one of Nectar’s adjustable bed bases, which come equipped with customizable massage mode, position presets, and under-bed lighting.

  • Pros

    1. High-value bundle includes a mattress, adjustable base, and full bedding set

    2. Choose from six Nectar mattresses and two adjustable beds

    3. Customizable massage mode alleviates pain and sore spots with gentle vibrations

  • Cons

    1. May be overkill for those who just need a new mattress

    2. Most Nectar mattresses produce strong off-gassing odor for the first few nights

Mattress Type

Foam

Firmness Options

Medium Firm (6)

Trial Period

50 nights

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.

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.

Nectar’s sleep trial for the mattress you choose runs for an entire year, ensuring ample time to test out the bed and decide if it meets your needs. Return options for other bundle components vary by item, but all orders within the contiguous U.S. qualify for free ground shipping.

The Saatva Classic toes the line between luxury and affordability, boasting an innovative coil-on-coil design that has proven immensely popular with sleepers. A yearlong sleep trial and free White Glove delivery further sweeten the deal for value-conscious shoppers.

  • Pros

    1. Coil-on-coil innerspring design feels exceptionally solid and supportive

    2. Available in three firmness levels and two profiles

    3. Free White Glove delivery with all purchases

  • Cons

    1. Responsive layers can cause movement-related sleep disturbances for couples

    2. $99 fee for all returns

Mattress Type

Innerspring

Firmness Options

Soft (3), Medium Firm (6), Firm (8)

Trial Period

365 Nights ($99 Return Fee)

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.

A layer of dense memory foam rests beneath your lumbar region to alleviate pain and soreness in your lower back and hips. For added comfort, you can choose between three firmness levels based on your weight and preferred sleep position. 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.

You can also choose between profiles of 11.5 or 14.5 inches. The latter has 3 extra inches of coil support, but you may need to invest in a fitted sheet with deep pockets if you choose the taller model. A cover made of soft, breathable cotton encases the mattress. Split king and split California king options are available for adjustable bed bases.

As part of Saatva’s White Glove service, couriers travel to your residence, assemble the Classic in a room of your choice, and remove your old mattress and box spring upon request. You’ll be able to test the mattress for up to 365 nights and return it for a full refund minus a processing fee if you aren’t satisfied. Those who keep their Classic receive a lifetime warranty against workmanship-related defects.

Thick foam layers and responsive coils make the DreamCloud Mattress one of the most universally comfortable beds on our team. The soft cashmere blend cover is a standout feature you don’t find in most beds at this price-point.

  • Pros

    1. Ultra-comfy combo of plush, adaptive foam layers and robust pocketed coils

    2. Cashmere-blend cover maintains a cool surface and wicks away moisture

    3. Each order includes a 365-night trial period

  • Cons

    1. Stomach sleepers over 230 pounds may require more support

    2. Foam produces some initial off-gassing

Mattress Type

Hybrid

Firmness Options

Medium Firm (6)

Price Range

$499 – $999

Trial Period

365 nights (30-night requirement)

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.

The Brooklyn Bedding Signature Hybrid has a nice balance of plushness and support that benefits a wide array of people, so it’s a good option for co-sleepers who have different mattress preferences. You can also lean toward firmer or softer thanks to the multiple firmness options.

  • Pros

    1. Available in three firmness levels

    2. Individually wrapped coils move independently to reduce motion transfer

    3. Priced competitively

  • Cons

    1. Foam may emit some off-gassing odors at first

    2. Foam layers might inhibit movement

Mattress Type

Hybrid

Firmness Options

Medium Soft (4), Medium Firm (6), Firm (8)

Trial Period

120 nights (30-night requirement)

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.

The Euro-top design of the Nolah Evolution 15 is a perfect match for side sleepers — with ample cradling for the shoulders and hips and plenty of support for the lower back. Plus, you get three firmness options to choose from.

  • Pros

    1. Available in three different firmness levels

    2. Zoned coil system provides extra reinforcement for heavy areas of the body and limits sinkage along the edges

    3. Engineered for cooling and temperature control

  • Cons

    1. Thick profile may require deep pocket sheets

    2. $99 fee for mattress returns

Mattress Type

Hybrid

Firmness Options

Medium (5), Medium Firm (6), Firm (8)

Trial Period

120 nights (30-night requirement)

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.

The Bear Elite Hybrid comes in two firmness options, and both excel when it comes to sturdiness. The lumbar support impressed most of our back and side sleepers during testing.

  • Pros

    1. Premium hybrid design combines cushioning foam layers and a robust coil system

    2. Customers can choose between three firmness levels ranging from medium to firm

    3. Cooling cover and steady airflow ensure excellent temperature control

  • Cons

    1. Some may find the 14-inch profile too high

    2. Expect some initial off-gassing from the foam

Mattress Type

Hybrid

Firmness Options

Medium (5), Medium Firm (6), Firm (8)

Trial Period

120 nights (30-night break-in period)

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.

Data-Driven Results You Can Trust

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.

Dive Deeper – In-Depth 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.

Price

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.

Contouring

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.

Still have questions?

Our product experts have extensive experience testing just about every sleep product on the market. Send an email to [email protected] or call us at (877) 672-8966 with your questions and we'll help you find exactly what you're looking for.

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