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Everything to Know About Split King Mattresses: Best Options, Where to Buy, and How to Pick the Right One

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Written by: Alex Savy
Read 18 minLast updated on September 1, 2021

A Split King mattress can offer a ton of benefits for couples.

This mattress size can become a perfect middle ground between comfort, sound rest, and partnered sleep.

But to get the most out of their Split King, shoppers need to know how to pick a suitable model. This Split King mattress review will cover the main shopping basics to help with that. It will share tips and product recommendations to make sure users choose the right mattress and enjoy restful partnered sleep.

A Quick Preview

The Refresh Mattress by Natural Form
Best Overall – Editor’s Choice

The Refresh Mattress by Natural Form
Read more about this mattress
The Natural Bliss by Plushbeds
Best for Eco-Conscious Users

The Natural Bliss by Plushbeds
Read more about this mattress
The Plank Mattress
Best for Heavier Sleepers

The Plank Mattress
Read more about this mattress
Brooklyn Signature by Brooklyn Bedding
Best for Value Seekers

Brooklyn Signature by Brooklyn Bedding
Read more about this mattress
Brooklyn Aurora by Brooklyn Bedding
Best for Side Sleepers

Brooklyn Aurora by Brooklyn Bedding
Read more about this mattress

What Is a Split King Mattress Size?

A Split King belongs to the standard mattress sizes, even though it’s not as popular as, let’s say, Queen. Split King measures exactly the same as the King size – 76 by 80 inches. However, as the name suggests, Split King models are divided into two smaller mattresses for increased convenience.

In other words, a Split King mattress would offer two separate Twin XL mattresses for each sleeper.

How Much Do Split King Mattresses Cost?

In most cases, Split King mattresses cost the same as standard King models. Prices vary depending on the mattress type and the brand, but in most scenarios, they fall somewhere between $1,200 and 1,800

Where to Buy a Good Split King Mattress?

This Split King mattress review will share the most trustworthy mattress retailers that carry the Split King size:

And if you are still a bit hesitant and don’t know which mattress size you need exactly, check out the selection of the best King size mattresses here.

Is the Split King Mattress Size Better than Standard King?

The short answer is yes, particularly for partners who can be easily disturbed during sleep.

The thing is, with a regular King mattress, each sleeper is very likely to feel the movement of their partner (especially if it’s a bouncier mattress type). This often makes couples sleep in separate rooms.

But here’s the deal:

Sleeping together is actually more beneficial for one’s health. Research suggests that bed-sharing is often associated with improved REM sleep (1), which usually means quality rest and makes users feel much better in the mornings.

Therefore, a Split King mattress size could be an excellent compromise in this scenario. It would allow couples to sleep together (and enjoy the benefits of bed-sharing) without disturbing each other during the night.

A Split King mattress would also come in handy for partners who have different comfort preferences. Many manufacturers allow shoppers to choose various firmness levels for the two sides of a Split King. Therefore, each sleeper can choose something that works for them perfectly. 

There are also California King mattresses available, which would be ideal for taller sleepers who find Split King models a bit limiting in terms of legroom. Read more about the top-rated California King-size mattresses here.

What Is the Best Type of Split King Mattresses?

Choosing a great mattress has a lot to do with its type. The thing is, each of them has a unique feel and a particular set of characteristics, some of which simply might not be suitable for certain sleepers.

That’s why this Split King mattress review is going to cover the most popular mattress types and their peculiarities. Hopefully, this could help shoppers make the right choice.

Memory Foam

Memory foam mattresses are popular among those sleepers who enjoy a deep hug. This mattress type is also famous for its adaptive properties. It does an excellent job of redistributing the tension evenly and thus, aiding fast relaxation.

Memory foam is also popular among partnered sleepers. This material moves slowly and does not allow the shock from motion to move across the surface of the mattress.

At the same time, cradling memory foam often sleeps hot (unless infused with gel or has an open-cell structure). It may also seem restricting to some users, especially combination sleepers.

Polyfoam

Similar to memory foam, polyurethane foam is also cradling and pressure-relieving. That being said, this material is slightly more resilient than memory foam. Therefore, it doesn’t usually feel that restricting.

Polyfoam is also cheaper and makes a good solution for budget shoppers. At the same time, this foam type is a bit less durable than memory foam.

Innerspring

Spring mattresses are responsive and bouncy. They can deliver resilient support and work great for active or combination sleepers. On the other hand, innerspring mattresses often lack in terms of pressure alleviation. They simply don’t use that much padding to cradle the pressure points.

This mattress type is great for shoppers on a budget. Spring models can also guarantee proper airflow during the night, which makes them an excellent choice for chronic hot sleepers. And since innerspring mattresses have sturdy edges, they offer extra sleeping space for couples.

Hybrid

As the name suggests, hybrid mattresses use combined materials to achieve a balanced feel

For the core, hybrids typically use independent coils. They offer reliable, responsive support. For the comfort layers, these mattresses usually combine multiple foam or latex layers (sometimes both). As a result, most hybrid mattresses deliver just the right amount of responsive support and gentle cradling for the pressure points.

Now, it’s worth mentioning that this mattress type tends to be bulky and tall. Hybrids can also be quite pricey, and considering that the Split King is a large size, this could mean a bit of a strain on some users’ budgets.

Latex

Latex mattresses are among the most durable ones. Additionally, they aren’t likely to retain heat and are more resistant to bacteria growth and dust mites. Needless to say, this mattress type is especially popular among eco-conscious shoppers who prefer natural materials.

Latex mattresses have a peculiar feel. Frankly, it doesn’t work for everyone, but this mattress type can still feel extremely comfortable. Latex is adaptive and can deliver targeted support for different body parts. This, in its turn, helps with effective pressure alleviation. At the same time, latex is quite resilient and takes its normal shape fast after the pressure is applied. Therefore, it feels responsive and does not restrict movement.

On the downside, latex mattresses tend to be quite pricey. They can also allow for motion transfer. However, this shouldn’t be an issue with the Split King size.

Things to Know Before Shopping for a Split King Mattress

When shopping for a good Split King mattress, the research doesn’t end with the mattress type. There are extra factors users may want to consider before investing in a new mattress. Each of them can affect one’s experience, so they shouldn’t be disregarded. They include:

  • Sleeping style. Each sleep position calls for a certain firmness level. This has to do with proper spinal alignment and support. An unsuitable comfort level can cause unhealthy back curvatures and consequently, pain. Now, the most common sleeping style is on one’s side. This position requires generous cushioning for the protruding body parts, so side sleepers are usually advised to pick softer mattresses. Back sleepers need something in the middle (medium to medium-firm). In this case, they will receive adequate support for the spine and a moderate amount of sinkage for the hips and buttocks. As for stomach sleepers, this sleeping style calls for a firm mattress. A stiffer sleeping surface will ensure proper support for the spine by eliminating sinkage in the hip or stomach area.
  • Weight. The sleeper’s weight can affect the supportive properties of their mattress. For instance, lightweight individuals (less than 130 pounds) often experience pressure accumulation, as their body weight isn’t always enough to compress the comfort layers. That’s why petite sleepers are advised to go one step softer for each sleeping style. As for heavier folks (those who weigh more than 230 pounds), they are recommended to choose firmer mattresses. This way, heavier sleepers will be more likely to receive adequate support needed for proper spinal alignment. 
  • Thermoregulation. Sleeping hot is a common issue for many users. It can ruin one’s experience even if their mattress corresponds perfectly with their sleeping style and other needs. To avoid that, shoppers need to know which mattresses are less likely to retain heat. They include innerspring, hybrid, and latex models. As for foam mattresses, some of them use gel infusion to eliminate night sweats. Some models also have an open-cell structure. It makes them more breathable and thus, less likely to sleep hot. 
  • Warranty. Most users know that a longer warranty often means better quality. However, it’s also crucial to read what exactly that warranty covers. In many cases, mattress warranties don’t protect against normal wear and tear or sagging, which may disappoint some shoppers.
  • Compatibility with adjustable bed frames. The beauty of the Split King size is that it allows for independent comfort adjustments for partners. In this case, using an adjustable bed frame could enhance the experience. Now, most foam and latex models work great with adjustable beds. As for hybrids, they may also do the trick, but only models that aren’t overly thick and use independent coils for the support core. The same rule applies to innerspring models.

Our Reviews of the 5 Best Split King Mattresses

Best Overall - Editor’s Choice — The Refresh Mattress by Natural Form

Refresh Mattress by Natural Form

 

Highlights

  • zoned support system to guarantee pressure-free sleep;
  • replaceable components for extra-long lifespan;
  • adjustable firmness to allow more users to find their perfect comfort setup.

What makes the best Split King mattress? Many factors, actually, but one of the most important is customization. And the Refresh mattress excels in this field. This model by Natural Form uses air chambers that can be adjusted, changing the feel of the mattress. This would come in especially handy in Split King size, as both you and your significant other can feel perfectly comfy without trying to find a compromise. For instance, I set my side to medium-firm while my wife changed hers to soft. Needless to say, we both could enjoy restful sleep. And the best part is, we could also change the firmness according to the occasion. For instance, I made my side slightly firmer when sleeping on my back to get optimal support.

Best for Eco-Conscious Users — The Natural Bliss by Plushbeds

Natural Bliss by Plushbeds

Highlights

  • all-latex construction to create a safe sleeping environment;
  • extra-long warranty for unparalleled customer protection;
  • 2 firmness and 3 thickness options to offer more comfort variations to different types of sleepers.

I think the next model on our list of the best Split King mattresses would work for anyone who wants to sleep on something natural and 100% safe. The Natural Bliss is an all-latex mattress. Due to its natural composition, it does not contain harmful chemicals. Additionally, latex is more resistant to allergens. I could really see the difference after switching to the Natural Bliss. The thing is, I often suffer from environmental allergies and wake up with itchy eyes and a stuffy nose. However, with the Natural Bliss, I did not face such a problem even after prolonged use. 

I was also impressed by the after-purchase adjustments the company offers. If the Natural Bliss doesn’t feel perfectly comfortable, you can get a different firmness layer for it. That’s something no other mattress on this list can boast of.

Best for Heavier Sleepers — The Plank Mattress

Plank Mattress by Brooklyn-Bedding-min

Highlights

  • flippable design to offer two firmness options in one model (great for uncertain shoppers);
  • extra-firm side to deliver truly sturdy support for larger folks;
  • proprietary TitanFlex foam for sweat-free sleep.

If you are a heavier sleeper, you will probably agree with me: sometimes, it’s hard to find a truly firm mattress. And that’s when the Plank can win the race. This is a firm mattress that delivers reliable support on both of its sides (one of them is just firmer than the other). It would come in handy for all the heavier stomach and back sleepers who are tired of sinking through the comfort layers of their supposedly firm mattress and waking up with a sore back. And let me tell you this: the Plank is truly firm. I tested it with my wife lying on top of me for the extra weight, and the mattress did not allow for any unwanted sinkage nonetheless.

Best for Value Seekers — Brooklyn Signature by Brooklyn Bedding

Brooklyn Signature Hybrid

Highlights:

  • three firmness options to satisfy more types of sleepers;
  • Titanium Gel infusion to prevent overheating during the night;
  • extra-strong perimeter coils for unparalleled edge support and a more spacious sleeping area.

Looking for the best Split King mattress that would leave some money in the budget for new sheets and other stuff you may need? Then the Brooklyn Signature may be the best solution in this scenario. This model comes with a very attractive price tag. However, with Brooklyn Bedding, a cheap price does not mean poor quality. The Brooklyn Signature is very nicely made. To me, it felt super robust, which surprised me given its affordability. Additionally, this mattress comes in three different firmness variations. This means the Brooklyn Signature can work for a wider range of users and different sleeping styles. For this price segment, that’s quite rare.

Best for Side Sleepers — Brooklyn Aurora by Brooklyn Bedding

Brooklyn Aurora by Brooklyn Bedding

Highlights

  • thick comfort layers to provide extra cushioning and to prevent sharp pressure points;
  • zoned coil system for pinpoint support and to achieve proper spinal alignment;
  • multiple cooling components to combat heat retention even when sinking deeper into the mattress.

For side sleepers, it can be hard to find the best Split King mattress that could do both: offer enough cushioning for the protruding body parts and stay cool all through the night. That’s when the Aurora by Brooklyn Bedding can earn its spurs. This model has thick comfort layers that reminded me of a Euro-top design. As a side sleeper myself, I appreciate that a lot. Lying on the Aurora mattress felt like a gentle hug. I did not develop any sore pressure points even after continuous use. And the best part is – I didn’t sleep hot either. This has to do with the combination of cooling components in this mattress, including gel foam and high-conductivity CopperFlex material.

F.A.Q.

Is Split King bigger than a King?

No, Split King is the same size as standard King – 76 by 80 inches. The only difference is that Split King is comprised of two smaller mattresses that make a standard King size together.

Why are Split King mattresses so expensive?

Split King mattresses are quite large, so manufacturers spend more time and use more materials making them. As a result, the final price for Split King mattresses can be rather high.

What kind of sheets will I need for a Split King mattress?

For a Split King mattress, sleepers can use two Twin XL sheets. Using King sheets is also possible, but since there’s a gap in the middle of a Split King mattress, standard King sheets may not fit (or fit too snuggly around the mattress).

Wrapping Up

A Split King mattress can be a wonderful solution for many couples. But to make sure it won’t disappoint, users need to shop wisely. It’s crucial to pick the appropriate comfort level based on one’s sleeping style and weight. Plus, learning more about different mattress types and their peculiarities may also come in handy. 

Want to hear which model managed to win my heart only after one night? It was the Refresh by Natural Form. Frankly, it’s hard not to love this mattress. It is adjustable and thus, always comfortable. It’s also very well-made and feels very sturdy, which promises durability in use. And if you are concerned about the price tag, don’t forget that the Refresh uses replaceable parts. This means you won’t have to buy a new mattress for years to come. All you have to do is buy separate parts that wear off. 

How about you? Have you picked your champion, or are you still considering a few mattresses? Let us know in the comments!

References:

  1. Henning Johannes Drews, Sebastian Wallot, Philip Brysch, Hannah Berger-Johannsen, and more (June 25, 2020). Bed-Sharing in Couples Is Associated With Increased and Stabilized REM Sleep and Sleep-Stage Synchronization. Retrieved from https://www.frontiersin.org/articles/10.3389/fpsyt.2020.00583/full

Our research

27

Mattresses Considered

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Hours of Research

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Sleep Experts Consulted

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