Best Split King Size Mattress (2025): Reviews and Buyer’s Guide

The first thing you’ll notice when lying down on the AS3 is its fantastic contouring ability. The AS3’s plant-based Bio-PurⓇ foam contours better than even the most high-quality petroleum foams. That means the AS3 offers so much pressure relief that even some side sleepers can enjoy it despite its medium feel.

The AS3 is also a lot more responsive than most other memory foam mattresses. The Bio-PurⓇ foam has a much quicker response time than petroleum-based memory foam. That means you won’t have to deal with body impressions or slow response time. That’s perfect for active sleepers who want memory foam beds.

Hundreds of people who purchased the Amerisleep split king mattress have left us feedback and almost all of them loved it, here are some of their thoughts:

Tpburris: Overall we are really happy with our beds. Since we have the split king mattress we both can raise the head and foot for what is comfortable to each of us. They have held up well so far, providing support without being hard. The only thing we do not like is the gap between the beds. We would still buy though even knowing that.

The Photographer: The twin/ split king mattress has been great we tend to sleep in the no gravity position. It has been great after recovery from an illness.

Disappointed: My husband and I got the split king mattress version of this bed for our primary use. The wall glide feature is exactly why I bought this over other models. It does not work. Overpaid by 100% due to false advertising. Bed squeaks.

Of their impressive selection, we recommend the AS3 mattress. This is our favorite option because it offers a universal comfort. The AS3 is a true medium on the firmness scale and is suitable for combination sleepers, side sleepers, and back sleepers.

It is soft enough to cradle the body, but it also has the perfect level of responsiveness to prevent sinking. When the joints are cushioned and the spine is resting in a neutral position, you will be able to find deep, restorative sleep.

The layers of the AS3 do all this and more! The soft, lightweight cover helps increase circulation to prevent overheating. Plus, this cover is removable and machine washable—allowing you to care for your mattress for many years.

The AS3 comfort layer features Amersleep’s Bio-Pur® foam—a unique plant-based memory foam that doesn’t trap heat like more memory foams. Bio-Pur® is made with partially plant-based oils, rather than 100 percent petroleum-based oils. This process results in a sleep surface that is non-toxic and safe.

Beneath the Bio-Pur® layer is Amerisleep’s Affinity foam with HIVE® technology. HIVE® is designed to comfort and support each area of the body differently. Vulnerable areas like the neck and back receive more firmness and stability with HIVE®. Near areas that often develop pressure points, like the hips and shoulders, HIVE® offers a plush cushion.

The support base of the AS3 is made up of Amerisleep’s Bio-Core® foam. This solid support base prevents sinking and maintains the structure of the mattress.

The Zoma Boost mattress is designed to offer a medium to medium-soft feel, which is typically preferred by side sleepers. The mattress has a comfortable and supportive feel, providing a good balance between firmness and softness.

Sleepers can expect to sink slightly into the mattress’s top layer of quilted foam, which conforms to their body’s shape, providing pressure relief and reducing motion transfer.

The infused memory foam in the Zoma Boost ensures that heat is drawn away from your body while you sleep, allowing you to remain cool and comfortable all night long. It also provides superior pressure relief, helping to reduce any aching or soreness associated with poor posture or sleeping on an uneven surface.

The Zoma Boost comes highly recommended by our testers regardless of the size:

Phillip L: Excellent bed. I highly recommend. Best nights sleep in a long time.

Gene J: I’m a male that is 250lbs and a side sleeper primarily but sometimes sleep on my back. The edge support is fantastic, very good pressure relief with excellent support.

Jordan B: As a healthcare professional that recommends mattresses to people every day, this is by far my number one mattress suggestion for patients. The Zoma Boost is perfect for all sleeping styles and it’s great for keeping the spine in a neutral alignment while you sleep.

The mattress’s advanced cooling cover is made of a breathable, stretchy fabric that promotes airflow and helps to keep sleepers cool and comfortable throughout the night. It’s swift to greet sleepers with a pleasantly icy feel, like a gentle cloud embracing the body. Quilted into this cover fabric is hypersoft foam for a pillowy feel.

The mattress’s primary comfort layer is made of graphite-infused memory foam, which provides pressure relief and reduces motion transfer. The gel infusion helps to regulate temperature and prevent heat buildup, making it ideal for sleepers who tend to sleep hot.

The next layer of the mattress is made of Reactiv™, a latex-like foam that provides support and bounce. This transition layer helps to prevent sinkage and promotes proper spinal alignment.

The mattress’s bottom layer is made of pocketed coils, providing a stable foundation for the mattress and helping to prevent sagging.

Customers who buy the GhostBed adjustable bed package have used the adjustable base with several mattresses with the Venus Williams model tending to be popular. Some even have mixed and matched different Twin XL models to best suit the needs of the user. But one thing they all shared in common is after reviewing over 100 comments, everyone loved this mattress and adjustable bed combo.

Just take a look at this sample of what some people who bought this package had to say:

Heather B: We got the split king adjustable base with one flex mattress and one Venus Williams hybrid mattress. Love everything. I had back pain with my old mattress and now it’s very minimal. The flex mattress was very firm at first and took a couple of night for my body to adjust but now it’s perfect. My husband loves his mattress as well.

Tami V: We have had a queen size bed for all of our married life (over 30 years) but have had issues with mattresses and one of us getting up and sleeping in a chair, etc. due to lack of comfort. My husband did the research and we ordered the split king mattress with Venus Williams hybrid mattresses.

Joseph H: The mattress we got is great, but I think my wife is more excited about the frame. We got the split king mattress with the adjustable, massaging bases. The zero gravity is her favorite. I find that the mattress has really been great for my back.

On top, the quilted cooling cover works with a layer of cooling fiber to create a feel that’s cool to the touch. Underneath, two layers of gel-infused memory foam work to pull heat away from your body. When the heat gets pushed down to the coil layer, it’s circulated out of the mattress to keep you cool and comfortable all night.

The individually wrapped coils also work with the Ghost Bounce layer to make this mattress highly responsive as well as extremely cool. And the high-density base layer ensures maximum motion transfer control, while the reinforced coils offer the best edge support.

Meanwhile, the luxury firm feel is perfect for maintaining healthy spinal alignment for those who prefer stomach sleeping as well as relieving back and neck pain for back sleepers.

The Saatva Classic provides all the comforts you’d expect out of an innerspring mattress. It bounces just like an innerspring mattress. And it’s highly breathable all the way through, just like an innerspring mattress. So those who have gotten used to the innerspring feel don’t have to worry about losing it if they purchase the Classic.

On the other hand, you also don’t have to worry about all the problems inherent to innerspring beds when you sleep on the Classic. The adaptable pocketed coil support layer makes the Classic much more contouring than a regular innerspring mattress. It also increases the motion isolating capabilities of the bed.

Several people bought the Saatva Classic for an adjustable bed, and most people we have come across love it:

Joseph P: We are seniors and have been waking up almost every day with a sore back, hips, etc. We went the expensive route- Temur Pedic, and they were good, but not working for us. We ordered the Saatva Classic 11.5″ since we have a split king adjustable frame. From the first night we said “finally this is the one.” We do not toss and turn 15x a night to get off our sore hips, in fact we only turn 1-3 times now!

Chrisitne: I got my split king mattresses today and couldn’t be happier. This is my second review. My first one was on the outstanding customer service. The company that was used for the delivery kept me informed from the time they received the order to pick up my mattresses all the way through the delivery process! I knew everything that was going on. The two men that delivered were courteous, fast and efficient.

Carol: We own two homes and purchased the Adjustable Split King Plus Bed and two Twin XL mattresses. The White Glove Delivery was phenomenal. We didn’t have to do a thing! One of us snores and putting the bed on the snore plus elevating a little bit more solved the problem!

The Saatva Classic starts out with a three-inch contouring Euro top. This layer offers pressure relief and comfort to tired joints. It’s also wrapped in a hypoallergenic organic cotton cover treated with GuardinTM botanical antimicrobial treatment that prevents bacteria, mold, and other icky things from flourishing in your mattress. This is a boon for allergy sufferers everywhere.

Below the Euro-style pillow top, you’ll find the high-density memory foam layer. This layer increases pressure relief above and also helps the mattress transition from foam and fibers to steel coils.

The first support layer of the Classic sits right underneath the transition foam layer. These adaptable pocket coils add contoured support to the Classic to help keep your spine in optimal alignment. This is also the coil layer that helps neutralize motion transfer.

The coil layer that provides innerspring bounce and breathability is the open coil support core right below the pocketed coils. These ultra-strong coils are 13-gauge tempered steel, so you won’t have to worry about sagging for a long time.

These networked coils are also surrounded by a perimeter railing system made of high-density foam. That means the Classic mattress boasts superior edge support to go along with its dual support cores.

The Vaya Mattress is a medium mattress—suitable for most sleep positions and body types. Beneath a lightweight cotton cover is a layer of soft, breathable foam. Vaya foam contours to the body for a weightless sleep and helps promote air circulation. This foam is also more responsive than traditional memory foam, which helps sleepers feel lifted on the mattress. This responsiveness also keeps the hips and shoulders aligned throughout the night. Supporting this soft layer is a support base of high-density foam for durability and structure.

Vaya is a bit limited on reviews, but they are mostly positive. Unfortunately, none of the reviews we looked at mentioned the split king mattress:

Leonard R: I am quite lightweight and I have been sleeping on uncomfortable memory foam before (feeling like I’m sleeping on the floor). This isn’t that same. My Vaya mattress is perfect for me.

Karen P: Very well made mattress, and I liked the idea of the hybrid. But unfortunately, it was much to firm for me. I tried to get used to it, but my hips are just too painful.

Toby S: I replaced the mattress (if you want to call it that) in my RV with yours and it was the best purchase I made! It’s a Murphy bed and unfortunately I can’t use the loveseat underneath the bed but who cares

Vaya’s proprietary Vaya Comfort Foam doesn’t retain heat and moisture the way traditional mattress foams do. This light, airy material contours to the body without causing night sweats and overheating. Plus, Vaya Foam has a slight bounce, which keeps the hips and shoulders lifted and aligned during sleep.

The pocketed spring coils in the base of the Vaya Hybrid mattress are triple wrapped in a soft, durable fabric for added comfort. These coils move independently of one another, allowing them to contour more closely to the body and relieve tension.

The perimeter of this base is also reinforced with edge support for added durability and motion isolation. Couples with different sleep schedules won’t have to worry about disturbing their partner on this stable and supportive base.

People who reviewed the Zoma Start appreciated its cooling AirCloth cover, its responsive Reactiv® foam layer, and its amazing ability to relieve pain and help sleepers wake up feeling refreshed and ready for another active day. While it’s design is budget-friendly, the Start doesn’t skimp on offering supportive comfort.

Some of the thousands surveyed on the Zoma Start had this to say:

Parth P: It is a phenomenal mattress especially for the price!

Billy K: Kind of firm waking up with shoulder pain occasionally

Xiao C: It’s of good quality overall. Came with proper packaging and easy to set up. It was a bit too soft for my back the first night, but after that I experience no back pain sleeping on it.

The Zoma Start features a 1-inch layer of gel memory foam to help wick away body heat, a 1-inch layer of Reactiv® material that offers adaptive support, and 8 inches of Support+® foam to firm up the mattress’s feel and help prevent sagging and soft spots. These foam layers are all wrapped up in a breathable AirCloth cover fabric.

Aside from staying cool at night, the durable materials inside the Zoma Start establish long-lasting motion isolation. The memory foam swallows movement at the point of impact, so if you shift positions in the night your partner sharing the bed won’t feel a thing.

The Zoma Start is also one of the top mattresses without fiberglass, a material that’s traditionally used to establish a flame-resistant bed. Fire safety is important, of course, but fiberglass has the drawback of causing skin irritation and breathing troubles if it escapes the mattress. Because of this, Zoma and many other manufacturers are moving to non-chemical alternatives for consumer safety.

The first thing you’ll notice about this mattress is just how cool it is. It boasts multiple cooling technologies like AirFoam™ and a cooling cotton cover to both draw heat away from you and keep the cool air flowing all at once.

People are overall happy with the Nolah Signature 12. While not many mention the split king mattress  specifically, several mention pain relief, but some have mentioned it doesn’t completely alleviate their pain:

David M: Purchased signature 12. I purchased because of the high ratings for hip pressure relief. I do think the bed is very comfortable, but it is not giving me the hip pressure relief I had hoped for. One thing I would change is the bed sleeps very warm.

Kathy C: Fast shipping, but I still struggle with some pressure points as a side sleeper.

Michele C: First mattress that is just right. I fall asleep easily, sleep well, and wake up rested without the usual stiffness that comes with having osteoarthritis.

The first layer of the Signature is the plush and breathable AirFoam™ that relieves pressure and keeps the cool air flowing.

Supporting the plush comfort layer are two layers of high-resilience and high-firmness transition foam. These layers keep the top layer buoyant and also protect you from pressure from the ultra-firm support core.

Finally, a layer of high-density core foam ensures that your mattress will stay sag and soft spot-free for many years. That’s why it sports a lifetime warranty!

As a medium mattress, the Zoma Hybrid is excellent for side and combo sleepers looking to alleviate pain. Customer reviews agree that whether you’re an athlete or not, the Zoma Hybrid mattress will cradle your body’s curves, support your back, and improve your sleep.

Most reviewers love the Zoma Hybrid including people who use the Twin XL and split king mattress models. Here is what some have to say:

Evonne B: This is my second zoma mattress. I bought a queen size a few years ago and this time I bought a king size. It’s so comfortable.

Jason D: Best mattress I’ve had to date. Took a chance on it after doing some research and really surprised. So comfortable for my preferences.

Dona F: The bed is so comfortable! My son is very tall and it’s a great fit! The delivery was fast! I’m going to purchase 2 more beds in the near future!

The bed’s top memory foam layer has infused gels for a cooler night of sleep. This layer also includes foam cutouts arranges in three support zones. Under your head, shoulders, and legs, cutouts are spaced further apart for added compression and pressure relief. However, along the back, the foam is firmer to support the lumbar spine and reduce over sinking.

A layer of Reactiv™ transitions between the bed’s comfort and support layer.  Reactiv™ is a buoyant foam that adapts to your movements, minimizing sinkage.

The hybrid contains supportive pocketed coils, with a foam base underneath for structure. Manufacturers wrap every coil in a pocketed coil system to reduce motion transfer and decrease noise. No matter how much you toss and turn, your partner should remain undisturbed.

The Avocado Green’s feel will vary depending on whether or not a pillow top is added on. The pillow top can soften the feel, though it will not turn it into a truly soft mattress.

Many would consider the Avocado Green with a pillow top as a medium to medium-firm mattress, feeling supportive with a touch of give under the body. Without a pillow top, the Avocado Green feels far firmer.

Avocado Green has over 90% of customers loving it, especially people who winded up buying the split king mattress option:

Elizabeth: I ordered 2 Twin XL standards for our king bed because a king would have been too heavy for us to turn. We followed instructions to unpack them and the process was easy. The 2 mattresses paired up perfectly in the frame. I needed ‘float on top’ firm and these are the perfect firmness for me.

Antionette: No more backpain when we get out of bed in the morning. Super comfortable. Only one (minor) disadvantage. We purchased the split king mattresses with pillow top. Some motion from your partner will be experienced, but not excessively.

Melissa A: Most comfortable mattress I have her slept on. Purchased split king mattress with adjustable frame and love the ability to adjust separately from my spouse.

The Avocado Green’s exact construction depends on whether a shopper chooses a pillow top or not. The pillow top adds on 2 inches of GOLS-certified latex and bringing the bed’s total cushioning layers to 5 inches.

Despite this thick amount of comfort material, the Avocado Green doesn’t feel overly squishy with a pillowtop, maintaining a comfortable supportive feel.

Next is 3 inches of latex foam, which serves as the first layer in a mattress without a pillow top. The support core consists of pocketed coils, arranged to create five zones of support under the body.

Encasing the mattress is a cover of organic cotton fabric, with underlying organic wool acting as the flame barrier. The mattress’s layers are held together by needle tufted rosettes, bypassing the need for chemical or water-based adhesives.