The 8 Best Split King Mattresses That Optimize Your Side Of The Bed

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We independently select all products and services. If you click through links we provide, we may earn a commission. Learn moreVettedMattress & SleepThe 8 Best Split King Mattresses That Optimize Your Side Of The BedBre RicheyContributorOpinions expressed by Forbes Contributors are their own.Forbes VettedJan 17, 2024,02:57pm EST

For many people, sleeping next to someone is comforting and can even reduce anxiety or help them fall asleep faster. But what happens when opposites genuinely attract and your mattress needs don’t align? That’s where the best split king mattresses can come into play. They allow you to pick your own firmness and feel for your side of the bed while also minimizing motion transfer.

According to Dr. Nathan Holley, a chiropractor with more than 12 years of experience in clinical practice, snoozing on a mattress better suited for your partner can have real consequences. “Not having the firmness your body requires can show up in many ways,” says Dr. Holley. “In addition to causing pressure point and alignment issues with the spine, circulatory, respiratory and muscle problems can also form when a mattress doesn’t suit the person.”

Luckily, you don’t have to compromise. Split king mattresses consist of two twin XL beds that sit together to form the equivalent of a king size mattress. While this offers all the space of a bigger bed, it allows each side to have a different comfort level to suit individual needs. See our top picks below for the best split king mattress for every couple.

Best Split King Mattress Overall: Nectar Premier Copper Best Value Split King Mattress: Leesa Studio Best Split King Mattress For Back Pain: Saatva Classic Best Split King Mattress For Side Sleepers: Helix Midnight Luxe Best Adjustable Split King Mattress: Saatva Solaire Best Cooling Split King Mattress: Brooklyn Bedding Aurora Luxe Best Firm Split King Mattress: Winkbed Best Organic Split King Mattress: Avocado Green Mattress

Best Split King Mattress Overall

A Fan Favorite With Cooling Features

MOST POPULAR

Nectar Premier Copper

Buy From Nectar

Type: Memory foam or hybrid | Firmness: Medium-firm | Delivery: Bed-in-a-box | Trial: 365 nights | Warranty: Lifetime

Thanks to its versatility, the Nectar Premier Copper is our top overall pick for the best split king mattress. Because it’s available in both memory foam and hybrid versions, this model is suitable for most sleeping positions. We recommend the hybrid option for back and combination sleepers who require more support and responsiveness and the foam model for side sleepers who want deeper sinkage. Nectar rates it at a 6.5 comfort level and calls it medium-firm, which is where comfort and support collide.

Seven layers comprise the hybrid version, including 4 inches of foam to contour your curves and relieve pressure. The coils are individually wrapped and respond to your movements with minimal motion transfer. Together, the foam and springs promote proper spinal alignment. The memory foam model is designed with several layers of foam that work in tandem to offer support while allowing crucial rebound. A cooling cover featuring copper fibers intended to dispel the heat and excess moisture tops both options. What’s more, both models are made with CertiPUR-US certified foams.

What our editors say: “I found the Nectar Premier Copper all-foam model to have a very classic memory foam feel with slow, deep sinkage,” says senior mattress and sleep editor Bridget Chapman. “There are mattresses out there with similar feels that cost a lot more money. However, I do think it’s firmer than advertised and would consider it a firm bed (rather than medium-firm).”

Best Value Split King Mattress

An Affordable Model That Offers Cradling Support

Leesa Studio Mattress

Buy From Leesa

Type: Foam | Firmness: Medium-firm | Delivery: Bed-in-a-box | Trial: 100 nights | Warranty: 10 years

As the overall pick for our list of best affordable mattresses, the Leesa Studio is a top contender for anyone looking for a budget-friendly split king mattress that doesn’t sacrifice quality. While it doesn’t have a specific split king option, buyers can choose two twin XL mattresses with a medium-firm feel. Plus, you don’t have to worry about that disagreeable off-gassing smell many foam beds have because it’s Greenguard Gold-certified and meets the strictest guidelines for VOC emissions.

This mattress is designed with three distinct foam layers. The base layer offers stability and support, the comfort layer contains billions of micro air capsules to help cool you down and the responsive memory foam contours for better alignment. It’s topped with a cover designed for both comfort and cooling. Together, the different types of foam combine to offer cradling support in nearly any position and relieve hip and shoulder pressure. While this mattress is competitively priced, it’s made with quality CertiPUR-US certified foam that ensures it doesn’t contain ozone depleters, flame retardants, formaldehyde and other harmful substances.

What our editors say: “For folks looking for a firm, affordable memory foam option that doesn’t let you sink in too much, this is a great choice,” says Forbes Vetted contributor Lindsey Vickers. She says since it allows you to sink slightly into the mattress to cradle you, it also offers excellent pressure relief. As a stomach sleeper, Vickers says she’d consider purchasing the Leesa Studio.

Best Split King Mattress For Back Pain

A Luxurious Option With Lumbar Zone Technology

Saatva Classic

Buy From Saatva

Type: Hybrid | Firmness: Plush soft, luxury firm and firm | Delivery: Free white glove delivery | Trial: 365 nights | Warranty: Lifetime

With a combination of memory foam, spinal wire and responsive coils, the Saatva Classic is engineered specifically to offer relief for achy backs and joints. Sitting at the base of the mattress are tempered steel coils surrounded by foam rails to help prevent sagging and create a stable edge. Above that are pocketed coils designed to hold strong and firm in the center third of the mattress (which is where most of the body weight is concentrated) to better contour your curves and relieve pressure points. To provide even more back support, this mattress also features a memory foam lumbar crown and spinal wire for healthy alignment.

Comfort and luxury are also key, and you can enjoy the plush 3-inch pillow top for cushioned relief. Plus, you can choose from three comfort levels — Saatva rates the plush soft as a 3 and recommends it for lighter-weight people or side sleepers, the luxury firm as a 5 to 7 for all sleepers and the firm option as an 8 and says it’s best suited for stomach or back sleepers. What’s most beneficial about a split king is the ability to get two twin XL mattresses in different firmness levels to ensure each partner has exactly what they need to snooze through the night.

What our editors say: Forbes Vetted mattress and sleep editor McKenzie Dillon says the Saatva Classic reminds her of mattresses you sleep on in upscale hotels and says it’s one of the nicest beds available for the price. She adds, “Its dual-coil design sets it apart from a majority of online beds that only have one innerspring layer. Combine this with its multiple lumbar support layers and plush pillow top, and you’ve got a great mattress for people with back pain.” However, she finds each model to be firmer than advertised.

Best Split King Mattress For Side Sleepers

A Memory Foam Mattress Designed Specifically For Side Sleepers

Helix Midnight Luxe

Buy From Helix

Type: Hybrid | Firmness: Medium | Delivery: Bed-in-a-box | Trial: 100 nights | Warranty: 15 years

The medium feel of the Helix Midnight Luxe makes it an excellent option for side and back sleepers or those who frequently toss and turn at night. The comfort level is rated a 5 to 6, making it soft enough to cushion the hips and shoulders yet firm enough to provide support. As a hybrid mattress, it contains both coils and foam. The individually wrapped coils are designed to cradle your body and reinforce support under the hips for lumbar support, while the memory foam reacts to your body weight to contour where it’s needed.

Another reason this mattress is ideal for side sleepers is its 14-inch depth, giving your body more than a foot of support and cushion. However, the medium-firm feel and slight bounce also makes this model great for other sleeping positions or those who toss and turn. Instead of a specific split king size, you need to purchase two twin XL mattresses.

What our editors say: Forbes Vetted executive strategy editor Lindsay Boyers recommends the Helix Midnight Luxe for side sleepers and mentions that both she and her fiancĂ© felt comfortable and supported throughout the night. Boyers also appreciates the foam as it dampened motion transfer, so you won’t get jostled awake when your partner or furry friend moves around. Chapman adds, “I think the Midnight Luxe is a great option for back and side sleepers who want just the right amount of cushioning and support. Overall, it’s a great value in my book.”

Best Adjustable Split King Mattress

A Breathable Model With 50 Firmness Settings

Saatva Solaire Adjustable Firmness Mattress

Buy From Saatva

Type: Foam air bed | Firmness: Adjustable | Delivery: Free white glove delivery | Trial: 365 nights | Warranty: Lifetime

If you’re ready to take control of your sleep and say goodbye to compromise, opt for an adjustable split king mattress that offers ultimate versatility for couples. For starters, this model allows each partner to choose their ideal comfort level from over 50 firmness settings. You can set it and forget it — or change the firmness if you’re lounging in bed to read. In addition to customizable firmness, you can also bundle the mattress with a split king adjustable base to raise the head or foot of your bed to always find the perfect position. Since it’s a split king, each partner can independently control their side of the bed.

As an airbed, the Saatva Solaire is constructed slightly differently than other mattresses — at the base is an air inflator and chambers that maintain the selected firmness evenly throughout the mattress. The top layers include a moisture barrier to protect the internal components, memory foam to offer pressure-point relief and latex that provides lumbar support. Plus, the gel-infused memory foam and breathable pillow top promote cooler sleep, according to the brand.

What the reviews say: One five-star review says, “My mother put in my head that firmer is better, but since having the Solaire, I prefer a softer mattress and sleep so much more comfortably now that I know. We even purchased the latex pillows and our sleep has never been better. We recommend this brand to anybody that asks. If we ever need a mattress for a spare bedroom, we will be coming back to purchase another Saatva for our guests.”

Best Cooling Split Mattress

A Cozy Option With Cooling Infused Foam

Brooklyn Bedding Aurora Luxe

Buy From Brooklyn Bedding

Type: Hybrid | Firmness: Soft, medium and firm | Delivery: Bed-in-a-box | Trial: 120 nights | Warranty: 10 years

The Brooklyn Bedding Aurora Luxe Mattress is available in three firmness levels, with the option of adding a cloud pillow top for additional comfort. The soft model (rated a 3 by Brooklyn Bedding) is recommended for side sleepers or those who enjoy the feeling of being hugged, medium (rated a 5) is best suited for combination back, stomach and side sleepers and the brand says those who snooze primarily on their stomach or back should choose the firm model, which is rated a 7. The multiple comfort levels allow couples to choose their preferred firmness level in a twin XL and combine them to create a split king bed.

Cooling is one of the primary benefits of this mattress, with a ton of features to ensure hot sleepers can find comfort. To start, it features a cover with cool tech fibers that actively work to remove excess heat from the sleep surface. The hybrid design boasts open cell technology for optimal airflow that prevents heat retention and cooling-infused foam that absorbs excess body heat.

What our editors say: Chapman has slept on the medium Aurora Luxe model with a pillow top and says she finds it comfortable for both back and side sleeping. “It has a nice level of cushioning and lift — you don’t get deep sinkage or feel stuck in the bed,” she says. “I also have found it to have strong motion isolation and edge support.” However, she also loves an extra soft mattress and says she could see herself swapping it out for the soft model.

Best Firm Split King Mattress

A Hybrid Mattress Available In 4 Firmness Levels

Winkbed

Buy From Winkbeds

Type: Hybrid | Firmness: Softer, luxury firm, firm or plus | Delivery: Bed-in-a-box | Trial: 120 nights | Warranty: Lifetime

If one partner requires an ultra-firm mattress, the split king Winkbed (which is made up of two twin XL mattresses) is a top choice. You can choose from four comfort levels. The firm is rated 7.5 out of 10 by Winkbeds and is designed for stomach sleepers, while the Plus is rated an 8 and is suggested for heavier individuals or those who need more back support. On the plush side is the soft model, which is rated 4.5 out of 10 and is recommended for side sleepers, and lastly, the luxury firm is rated 6.5 and suggested for combination sleepers.

As a hybrid model, it contains both foam and innersprings. The individually pocketed coils are designed to provide targeted back support in the areas where you need it most. Sitting atop the coils is gel foam to absorb motion transfer and a foam Euro pillow top to keep your back, hips and shoulders aligned.

What our editors and the reviews say: Chapman says the Winkbed embodies a luxury innerspring feel. “It reminds me of a mattress you’d find in a nice hotel and is extremely supportive. I also really appreciate how breathable its materials are.” One five-star reviewer adds, “I’ve had the [Winkbed Plus] mattress for two and a half months now. I weigh 350 pounds and this is the first mattress I’ve owned that has enough support in the middle. I don’t have back pain anymore.”

Best Organic Split King Mattress

An Eco-Friendly Bed Made With Certified Organic Material

Avocado Green Mattress

Buy From Avocado

Type: Hybrid | Firmness: Plush, medium or firm | Delivery: Bed-in-a-box with optional white glove delivery | Trial: 365 nights | Warranty: 25 years

Avocado Green is known for using quality products with certified organic materials, so you can feel good about what you’re sleeping on while you have a restful night. The brand doesn’t use polyurethane foam, chemical adhesives or flame retardants and also ensures every mattress is Greenguard Gold Certified for low emissions. Plus, each mattress is needle-tufted by hand and assembled in the United States.

It’s available in a plush, medium or firm feel, making it a good fit for most sleepers. The plush sits about 15.5 inches high, while the firm features less latex and is 11 inches tall. In addition to GOLS-certified organic Dunlop latex, this hybrid mattress also features individually encased steel coils arranged in seven distinct zones to keep your back aligned and distribute weight more evenly. The coils also float independently to contour your body’s natural curves.

What our editors say: Boyers tested the medium firmness with the pillow top and highly recommends it for a plush feel with ample support. She thinks the pillow top was great at isolating motion, and she could barely feel her partner moving around in bed. “The biggest draw of the Avocado Green Mattress is its natural and organic construction, but it’s also super comfortable.” Chapman agrees the pillow top Avocado Green model has a soft, plush feel. “It’s definitely a soft, bouncy and supportive bed,” she says.

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Why Trust Forbes Vetted

The Forbes Vetted team spends countless days and nights researching, testing and thinking about sleep. And just like you, we yearn for a restful night of sleep and actively search for the best products to make that happen. From the editors to the writers, we’ve produced hundreds of guides on mattresses and sleep in which we interview medical experts, rely on firsthand experience and consult top mattress brands. We continually monitor discounts and product information to make sure this guide is always up to date.

How We Chose The Best Split King Mattresses

To ensure we offer the best products, we consulted Dr. Nathan Holley, D.C., a chiropractor with a dozen years of clinical practice. When asked for his advice to those seeking a split king mattress, he said, “I always recommend mattresses with a trial of at least a month or more to see if their back responds well. Adjustable mattresses are also a huge plus if you want to go that route, as they can be customized to the patient.” Because of this, each mattress on our list has a trial period of no less than 120 days and a warranty of 10 years minimum. We also included an adjustable mattress and models that are compatible with split king adjustable bed frames.

Of course, each model is available in a split king or a twin XL (which means you have to buy two). We wanted to make sure all sleeping types could find a suitable mattress, which is why we included air bed, memory foam and hybrid options, as well as comfort levels ranging from soft to ultra-firm. What’s more, most of the mattresses on this list have been personally tested by our Forbes Vetted editors, including senior sleep editor Bridget Chapman and sleep editor McKenzie Dillon.

What To Look For In The Best Split King Mattresses

Mattress Type

Innerspring: The classic bouncy mattresses most people remember from their childhood are innerspring mattresses. They feature optimal airflow to help you sleep cooler and allow bounce for combination sleepers to change positions easily. However, they’re typically not as soft and conforming to the body as other mattress types. Foam/Memory foam: According to Dr. Holley, “Memory foam tends to do better distributing weight and helping pressure points throughout the body. One major criticism is the feeling of being stuck in the mold as well as overheating, as it tends to trap heat easier. Memory foam seems to have more benefits for people with back pain, since it can support the natural curve of the spine.” Hybrid: With both innersprings and foam, hybrid mattresses are the happy medium blend for some people. Hybrids have a supportive spring system on the bottom with comfort layers on the top (usually made of foams), creating a balanced feel. Adjustable/Airbed: Adjustable mattresses allow you to change the firmness level of the mattress, usually due to air chambers in the bed that add air or let out air. It can also refer to beds with an adjustable base that allows you to raise the head and feet.

Firmness

Your ideal firmness level is primarily based on your sleeping type, which is why couples may require different comfort levels for a restful night of sleep. To find the ideal feel, Dr. Holley says, “For the majority of my patients, I recommend firm to moderately firm as studies show it’s best for spinal alignment. However, this changes from patient to patient, with the focus being the firmness that allows for the best spinal posture while sleeping.”

Soft: On a scale of 1 to 10, soft mattresses are generally a 3 to 6. Because it’s more plush, it’s recommended for side sleepers that require additional contouring or lighter-weight sleepers that aren’t going to sink deeply into the mattress. It’s likely too plush for stomach sleepers. Medium-firm: Between 6 and 7 is typically considered medium-firm and is recommended for combination sleepers who move around or for back sleepers. It gives off the feeling of laying on the bed without sinking in too much. Firm: A 7 out of 10 and above is usually considered firm or ultra-firm. Sleepers who prefer feeling like they’re on top of the bed with no sinkage do well on firm beds. Firm mattresses are best for stomach or back sleepers and likely don’t offer enough contour for side sleepers.

Split King Features

“Couples that prefer different sleep preferences and firmness levels benefit from a split king bed,” says Dr. Holley. With a split king, each partner can choose a mattress that suits their individual firmness level while still being able to share a bed. However, there are also other features to consider.

Motion isolation: When sharing the bed with someone else, it’s common to wake up your partner when you use the bathroom in the middle of the night or get up early for work since your movements can travel through the bed. While some mattress designs actively work to decrease this motion transfer by absorbing the movement, they’re not fool proof. With split king mattresses, you are sleeping on a completely separate mattress, which offers top-notch motion isolation. Adjustable base: A major benefit of split king mattresses is most are compatible with adjustable bases. Having two mattresses lets each partner independently adjust the angle of their head or feet for optimal comfort.

Can You Feel The Crack In A Split King Mattress?

Yes and no. While there’s no denying the crack in a split king mattress, most modern designs actively work to keep the two sides together — so it’s possible to forget about the crack entirely. A few of these features include connectors that keep each twin XL mattress together or anti-skid fabric to prevent each one from sliding. Additional solutions are mattress pads or mattress toppers to truly create a seamless experience. However, for those who often sleep on the center of the mattress or have a child sneak into their bed in the middle of the night, the crack can be more noticeable.

What Are The Cons Of A Split King Mattress?

In addition to the crack in a split king mattress, there are a few other cons to consider. First, options may be limited as not all brands carry split king or twin XL mattresses. However, the size is becoming more common, with available options in just about every mattress type and firmness level. Another factor is the price. For example, a split king mattress or purchasing two twin XL mattresses is usually more expensive than the equivalent king mattress.

What Type Of Sheets Are Best For A Split King Mattress?

Split king sheets are commonly available and generally come with two twin XL fitted sheets, king size pillowcases and a king size flat sheet. If you don’t have a split king adjustable base, standard king size sheets fit over both of the mattresses and may even help keep them together.

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