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Best Split King Mattress: Reviews and Buyer’s Guide

Malena Piper

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When you’re looking for a new mattress, you will want to consider the size best for you.

Most couples are sleeping on a mattress too small to accommodate their bodies and sleeping styles. For most couples, a king mattress can improve sleep quality and promote comfort, although some sleepers experience better sleep on a split king mattress.

Some people don’t like the idea of a split king mattress because the sleep space is made of two twin XL mattresses pushed together to form one bed; however, other sleepers have found the split king offers a customized sleep surface, which leads to fewer sleep disruptions.

This article discusses our recommended best split king mattress and the benefits of having a split king bed. We will also explore how to choose the best-personalized split king mattress by considering body type, sleep position, and mattress type.

Best Split-King Mattress

MattressHighlightsPrice
BEST COUPLE'S MATTRESSAmerisleep AS3
The AS3Amerisleep
Partially plant-based foam is more responsive and breathable than traditional memory foam.
$2398Buy Now
BEST OVERALL HYBRIDAmerisleep AS3 Hybrid
The AS3 HybridAmerisleep
Zoned technology offers three distinct comfort zones, relieving pressure points and pain.
$2798Buy Now
BEST MATTRESS FOR ATHLETIC COUPLES Zoma Sports Mattress Closely grouped triangular cut-outs offer firm hip support, preventing spinal misalignment.
BEST GEL MEMORY FOAM HYBRID Zoma Hybrid Mattress Pocketed coils provide targeted support.
$1598Buy Now
MOST COST-EFFECTIVE MATTRESS Vaya Mattress Affordable split-king option for sleepers on a limited budget.
$449 x 2Buy Now
BEST SPLIT KING MATTRESS BUNDLE
Split King Set GhostBed
Set includes a GhostBed mattress with a split king base and two remotes.
$4588 to $7098Buy Now
Purple Mattress
PurplePurple Mattress
The Purple® Grid gives under pressure to accommodate most body types and sleeping positions.
$1099Buy Now

Best Couple's Mattress: Amerisleep AS3

amerisleep AS3 mattress best mattress in a box BEST COUPLE'S MATTRESS
Amerisleep AS3

Amerisleep’s medium option is its most popular bed, capable as it is of providing most sleepers with comfortable sleep.

Earn 30 percent off an AS3 Mattress

Enter code AS300 at checkout

Get discount
Best mattress features
  • Affinity layer buffers the comfort and support layer for a more responsive and conforming feel.
  • Light and soft cover allows air to enter the mattress, taking unneeded heat away.
  • Breathable Bio-Pur® foam top is processed from plant-based chemicals and other materials.
Recommended for...
  • Plus-sized people interested in sharing a durable bed.
  • Side and combination sleepers interested in relieving pressure points.
  • Most couples, particularly those with conflicting firmness preferences.

The Amerisleep AS3 is a medium mattress; it’s versatile so it can support varied sleeping styles and body types. The mattress has a 12-inch profile and can support up to 800 pounds.

The lightweight, breathable cover keeps air circulating around the mattress so you always sleep cool. It is also removable and completely washable so you can easily keep your mattress clean.

The Bio-Pur® memory foam comfort layer conforms to you to alleviate pressure points and pain.

The third layer, Affinity material with HIVE® technology, has hundreds of hexagonal-shaped cut-outs divided into five comfort zones to offer the head, back, and feet firm support and extra cushioning under the shoulders and hips. The Affinity layer transitions between the comfort and support layers to prevent you from bottoming out on the high-density foam.

The Bio-Core® support foam prolongs the mattress’s lifespan by preventing premature sagging and supporting the upper layers.

Amerisleep offers a 20-year warranty. Amerisleep replaces every defective mattress under the warranty’s terms, including lasting indentations greater than 0.75 inches.

Amerisleep’s 100-night trial offers enough time to try the mattress, decide if you like the product, and return it if it doesn’t meet your expectations.

Best Overall Hybrid: AS3 Hybrid

as3 hybrid BEST OVERALL HYBRID
Amerisleep AS3 Hybrid

Amerisleep’s new hybrid version of the original AS3 has the same great features and feel with some added bounce.

Earn 30 percent off an AS3 Hybrid

Enter code AS300 at checkout

Get discount
Best mattress features
  • Same eco-friendly comfort foam as the original AS3 mattress.
  • Breathable Bio-Pur® foam and airy coil maximizes airflow through the mattress, wicking away heat.
  • Three support zones, with the ends focused on pressure relief and the midsection focused on support.
Recommended for...
  • Combination sleepers interested in a springy mattress that lifts them for easier movements.
  • Side sleepers with back pain or who simply wish for a bouncy bed.

The Amerisleep AS3 Hybrid is a medium feel mattress. It offers targeted comfort to relieve pressure points and is great for back and stomach sleepers. The AS3 Hybrid has a 12-inch profile and can support up to 800 pounds.

Like the traditional AS3, the AS3 Hybrid also features a soft, breathable cover that can be removed for washing.

The Bio-Pur® comfort layer contours to your body, alleviating pressure without causing you to sink too deeply into the mattress.

A layer of pocketed coils are grouped in three comfort zones to offer softness in the head and foot and firm support in the back area. The coils reduce pain by improving spinal alignment and alleviating pressure.

Below the coil system, a high-density foam increases the mattress’s lifespan and maintains its shape.

Amerisleep’s warranty lasts 20 years. Amerisleep replaces a defective mattress if the mattress sags greater than 0.75 inches, the foam cracks or splits, or there are any cover flaws.

The 100-night offers a period where the customer may try the mattress without financial risk. If the sleeper decides the mattress isn’t satisfactory after breaking it in, they may return the bed.

Best Mattress for Athletic Couples: Zoma Mattress

Zoma BEST MATTRESS FOR ATHLETIC COUPLES
Zoma Mattress

Zoma’s cool comfort layer, responsive transition layer, and durable support layer work together to create a mattress that helps you achieve a night of uninterrupted sleep.

Earn $150 off the Zoma Mattress

Enter code WIN150 at checkout

Get discount
Best mattress features
  • Stretchy mesh cover promotes airflow through the mattress, pulling away heat.
  • Reactiv™ acts as a responsive buffer, keeping a sleeper from bottoming out on the base layer.
  • Triangulex™ foam increases pressure relief around your head, shoulders, and legs.
Recommended for...
  • Couples who work out, together or separately.
  • Couples where one or both partners have chronic pain issues.
  • Couples where one or both partners sleep hot.

The Zoma Mattress offers a balance of support and comfort—great for athletes or those with physically active jobs. The mattress has an 11-inch profile and can bear up to 800 pounds.

The polyester-elastane cover stretches to encourage airflow.

The gel-infused memory foam with Triangulex™ technology is divided into three comfort zones. The ends of the layer are soft to relieve pressure points on the head, shoulders, and feet, while the middle section offers firm hip support to prevent sinkage and misalignment.

Below, two inches of latex-like material called Reactiv™ buffer between the comfort and support layers, preventing the sleeper from hitting the firm foam and developing pressure points.

Zoma replaces defective mattresses under the terms of the 10-year warranty, including sagging greater than 0.75 inches.

If you find the Zoma mattress unsatisfactory after breaking it in, you may return it with no financial risk.

Best Gel Memory Foam Hybrid: Zoma Hybrid

zoma hybrid BEST GEL MEMORY FOAM HYBRID
Zoma Hybrid

Innerspring coils encased in fabric not only keep movement from rippling across the mattress but ensure a quiet night free of squeaks and creaks.

 

Earn $150 off the Zoma Hybrid

Enter code WIN150 at checkout

Get discount
Best mattress features
  • Firm foams surround the coils, providing edge support for easier movements in and out of bed.
  • Wrapped pocketed coils leave room for air to circulate and remove heat.
  • Every innerspring coil is wrapped for independent reaction, moving and adjusting to a sleeper's body.
Recommended for..
  • Athletic couples who want the best of a foam and innerspring mattress.
  • People with back pain, or other pain issues, searching for cool pressure relief.

The Zoma Hybrid is another great mattress option for customers looking to buy a split king mattress. Similar to the Zoma Mattress, the Zoma Hybrid has a support layer filled with pocketed coils for long-lasting support.

The bed is topped with gel memory foam, which absorbs and dissipates body heat to regulate temperature. This layer also has zoned support—hundreds of triangular segments form into a 3-zone support system. Areas under the back and hips feel firmer, and areas under the head, shoulders, and legs feel softer.

Reactiv™ is the transition layer. This highly-responsive foam adjusts to your weight and encourages spinal alignment. You can rest easy without feeling stuck inside the bed.

Individually-wrapped innerspring coils make up the support layer. Pocketed coils react under pressure, providing you and your partner with support in areas you need it the most, like your lower back. Pocketed coils also give the bed better edge support, a nice feature if you prefer sleeping on the edge of the mattress.

During the warranty period, if you experience sagging greater than 0.75 inches or notice any manufacturing defects, including broken seams, Zoma will repair or replace the mattress at no extra charge to the customer.

Zoma gives customers up to 100 nights to try out the Zoma Hybrid. If you don’t like the bed after giving yourself time to adjust to its feel, Zoma will issue a full refund.

Most Cost-Effective Mattress: Vaya Mattress

Vaya Mattress MOST COST-EFFECTIVE MATTRESS
Vaya Mattress

The 12-inch bed costs a fraction of the price of a similar mattress, while still providing the same great comfort and support.

Earn $300 off the Vaya Mattress

Enter code VAYA300 at checkout

Get discount
Best mattress features
  • First layer has an airy, open-cell structure so heat can escape,
  • Supportive core layer endures wear and tear well, promoting a long-lasting mattress.
  • Quality materials create a durable yet inexpensive mattress, providing great value for your dollars.
Recommended for...
  • Young adults looking to make their first big mattress purchase.
  • Sleepers who want a mattress that suits all sleeping positions.
  • Couples hunting for a bargain mattress.

If you’re looking for the best mattress for the lowest price, the Vaya Mattress is one of the best value beds we recommend. At only $599 for a queen, the Vaya contains high-quality foams and comes with an industry-standard 10-year warranty—which is rather uncommon for a budget bed.

The Vaya is medium in firmness and recommended for side, back, and combination sleepers. While the Vaya is designed for universal comfort, most stomach sleepers will need a firmer mattress to achieve comfortable sleep. The Vaya features two layers of foam: 3 inches of pressure-relieving Vaya Comfort Foam and 9 inches of sturdy base foam.

The top layer of Vaya Comfort Foam is thick enough to cushion the shoulders and hips without causing uncomfortable sinkage. It’s both cushioning soft and responsive, so it alleviates pressure while keeping you lifted in healthy alignment.

Below the comfort layer is a durable core layer of foam to keep you supported for years to come. It’s firm enough to keep you lifted in the bed, but not so firm that you feel like you’re sleeping on a rock.

While the Vaya is not sold in a split king size, you can purchase two of these twin XL mattresses and place them side-by-side in a king bed frame or on an adjustable bed and they’ll serve the same purpose. Plus, with how affordable they are, you can usually purchase two of these twin XL mattresses and still spend less than what you would with other brands.

Every Vaya comes with a 10-year full replacement warranty covering manufacturing defects and sags .75 inches deep and thicker.

Vaya sells their mattresses online-only so they offer a 100-night, risk-free sleep trial with every purchase. If you don’t completely love the Vaya Mattress after a couple of months, you have the option to return it for a full refund.

Best Split King Mattress Bundle: GhostBed Split King Adjustable Set

GhostBed Split King BEST SPLIT KING MATTRESS BUNDLE
GhostBed Split King Adjustable Set

Split king mattresses are commonly paired with adjustable foundations for customized comfort. GhostBed offers a bundle with a mattress and base for a deeper discount.

Best mattress bundle features
  • Each half of the base has its own remote for independent movement.
  • Fifteen massage modes for relaxation and comfort.
  • Under-bed lighting, USB ports, plus a flashlight in the remote.
Recommended for...
  • Couples who want to sleep in different elevated positions.
  • Bargain hunters and budget shoppers seeking a deal on an adjustable base.

Because it can be a hassle, not to mention more expensive, to buy a split king mattress and an adjustable base separately, the GhostBed Split King Adjustable Set is one of our favorite ways to streamline your shopping experience.

The four mattresses shoppers can choose from are:

All of their mattresses are made in the USA.

The adjustable bed is two separate bases, each with a remote to control its movements. Other features include 15 massage modes, including intensities for the head and feet; five preset positions for quick customization; under-bed lighting; and USB charging ports for devices.

GhostBed’s mattresses come with a 101-night sleep trial and a 20-year warranty. The GhostBed Adjustable Base comes with a limited lifetime warranty. For an extra fee, you can increase the warranty’s offered protection.

Original Purple® Mattress

purple mattress ORIGINAL PURPLE® MATTRESS
Original Purple® Mattress

The exclusive Purple ™ reduces pressure and encourages airflow for cooling cushion, while the base layers offer responsive support.

Best mattress features
  • The soft knit cover makes it easy for air to slip in and travel through the Purple Grid™'s air channels.
  • Poly-foam layer buffers between the Purple Grid™ and the base layer to decrease pressure.
  • Hyper-elastic, durable materials ensure the mattress lasts for several years.
Recommended for...
  • Side, back, and stomach sleepers.
  • People of all body types, from petite sleepers to larger individuals.

The Original Purple® Mattress contours to alleviate pressure while promoting air circulation to cool the sleeper. The mattress is hypoallergenic, durable, and supports most sleep positions.

The soft knit cover increases the mattress’s breathability.

The Purple Grid™ limits motion transfer to prevent sleep disturbances by giving way to weight. It adjusts to most sleeping positions and body types to promote airflow and alleviate pressure points.

Below the comfort layer, a poly-foam layer transitions between the comfort and support layers.

Lastly, high-density support foam increases the mattress’s lifespan by preventing premature sagging.

Purple’s limited 10-year warranty states Purple replaces or repairs defective mattresses, including sagging deeper than 1 inch.

Every Purple mattress comes with a 100-night sleep trial. The sleeper is required to sleep on the mattress for 21 nights; however, they may return it within the 100-night trial period if they are unsatisfied with the product.

What is a Split King Mattress?

A split king mattress has the same sleeping space as a traditional king bed. The difference? A split king mattress is made by pushing two twin XL mattresses together to form the dimensions of a king-size bed (76 inches wide by 80 inches long).

And 80-inch length accommodates the height of most adults, so their toes don’t hang over the bed’s edge, which causes sleep disturbances. The 76-inch width offers enough space for two adults to sleep comfortably.

Benefits of Split King Mattresses

Resolves home moving issues. Two twin XL mattresses are more manageable to move than a full king size mattress.

Ends motion transfer. Motion cannot transfer from one bed to another. If your sleeping partner switches sleep positions, the motion is isolated on their mattress, allowing you to sleep through the night undisturbed.

Allows personal space. Personal space is important—especially where sleep is concerned. Your sleeping partner can prevent you from spreading out and decrease your quality of sleep. The two twin XL mattresses offer a defined line indicating whose side of the bed is whose.

Accommodates separate sleeping preferences. It isn’t often someone has the same firmness preference as their partner. Even a couple sleeping in the same position can prefer different firmnesses due to their body types. A split king mattress allows a couple to get two firmness levels to cater to two sleep positions and body types so nobody has to compromise their comfort.

Adjustable Bed Compatibility. Split king mattresses pair very well with adjustable king bed bases. Adjustable beds are great for those with lower back pain, osteoarthritis, skeletal pain and can reduce symptoms of sleep apnea, acid reflux, and snoring.

An adjustable king foundation comes as two separate bases to make moving easier. The split frames also offer couples flexibility, so one partner can raise the head of their mattress while the other lies flat.

An adjustable bed works best with a latex or memory foam mattress as they are flexible enough to bend with the foundation. Most innerspring and hybrid mattresses are constructed with stiff materials and can slide off an adjustable base if not able to bend with the foundation. If you favor hybrid and innerspring mattresses, we suggest asking the manufacturer if the bed is compatible with an adjustable foundation.

Split King Bedding

A split king bed needs different bed sheets from traditional king beds. Separate sheets need to go over each twin XL mattress as a king-size fitted sheet may slip off the mattresses and compromise protection from dust and debris.

You can use a king-size flat sheet on top of the two mattresses alongside a duvet to make up the split bed as one mattress.

Most companies selling split king mattresses offer split king bed sheets, consisting of two twin XL fitted sheets, one king-size flat sheet, and two pillowcases. You may also modify a split king bed sheet set yourself by buying the sheets separately.

How to Pick the Best Split King Mattress

Your sleep preferences influence the type of mattress and firmness you end up buying. Other considerations, such as warranties, return policies, and sleep trial, can affect how you shop for your next bed.

Sleep Positions and Body Type

A sleeper can experience pain with a plush mattress when their perfect firmness is a firm mattress. To avoid getting the wrong firmness, consider your preferred sleep position and body type.

The best mattresses for side sleepers are plush to medium in firmness, as these beds can alleviate pressure points and pain.

If you need a comfortable mattress for back sleeping, you’ll likely prefer something medium to medium-firm. A firmer mattress prevents the hips from sinking below the stomach, leading to herniated discs, sciatica, and lower back pain.

The best mattresses for stomach sleepers are firm, as firm beds prevent back pain in this sleeping position. Firm mattress materials prevent the sleeper’s hips and shoulder from bowing into the bed, causing misalignment.

Light people don’t have the weight to sink into a firm mattress. A soft mattress contours to petite sleepers to compensate for the lack of pressure, offering conformability and pressure relief.

Heavy people sink just enough into firm mattresses enough that the mattress conforms closely and relieves pressure points. Heavy people should avoid sleeping on overly soft mattresses as the hips and shoulders could sink, causing spinal misalignment and pain.

Mattress Material

Exploring different types of mattresses will help you discover which bed materials fit your sleep needs best. Each mattress type offers unique levels of motion isolation, conformability, pressure relief, and temperature neutrality. Some types of mattresses are more expensive than others. Depending on your budget and sleep needs, you may choose one mattress over another.

Innerspring Mattresses

An innerspring mattress is made of a coil core with a thin wool, polyester, or cotton comfort layer. Innerspring mattresses are very supportive and promote airflow through the mattress core to cool off the sleeper.

Due to their open coil systems, an innerspring mattress collects allergens, dust, dust mite, and other debris, which can irritate sensitive respiratory systems.

A split king innerspring can provide bounce and excellent lumbar support; however, check with the manufacturer to confirm that the mattress is compatible with a split king adjustable base

Hybrid Mattresses

Hybrid mattresses are constructed with coil systems and memory foam or latex comfort layers. They’re great for people who enjoy the bounce and support of an innerspring mattress and the conformability of memory foam and latex.

Hybrids are more temperature-regulating than memory foam mattresses but less so than innerspring mattresses. On this flip side, hybrids have great motion isolation from the memory foam comfort layer.

Memory Foam Mattresses

Memory foam mattresses are known for their support and conformability. Their ability to alleviate pressure and promote spinal alignment relieves lower back and joint pain.

You often see memory foam mattresses advertised as bed-in-a-box brands. No matter what memory foam mattress you buy, it can bend with an adjustable frame.

Latex Mattresses

Latex mattresses are made of one of four types of materials: Dunlop latex, Talalay latex, synthetic latex, and blended latex.

The Dunlop process involves processing rubber tree sap.  Dunlop latex is firm and dense. It is antimicrobial, hypoallergenic, and less expensive than Talalay.

Talalay latex is made from rubber tree sap. The chemical process used to create this form of natural latex makes it soft, bouncy, and light. Talalay is also antimicrobial and hypoallergenic.

Synthetic latex mattresses don’t have the health benefits of natural latex because they are made from a chemical compound to mimic latex properties. This material is cheaper than natural latex and great for those with latex allergies.

Blended latex is a mixture of natural and synthetic latex. The material retains some antimicrobial properties.

We do not recommend people sleep on mattresses with synthetic materials, as they may contain harmful additives. If you decide to buy a synthetic mattress, we highly suggest getting a bed with a CertiPUR-US® certification to ensure the mattress is safe.

Warranties, Sleep Trials, Return Policies

Warranties, sleep trials, and return policies are put in place to prevent the customer from getting stuck with a defective product. Make sure your prospective mattress has a good protection plan, or you may find yourself with a low-quality mattress.

  • A warranty should last at least 10 years, and the mattress company should bear full financial responsibility for the mattress’s replacement or repairs and transportation in the case of a defective mattress.
  •  A sleep trial period should last at least 100 nights. This will give you enough time to try and adjust to the new mattress, decide if the bed meets your sleep needs, and return it if it doesn’t.
  • Make sure the return policy does not require the customer to pay a return fee, restocking fee, or donation fee. A company should take responsibility for picking the mattress up and disposing of it properly.

Looking for an Adjustable Bed Base?

The price of an adjustable bed frame is influenced by the number of features built into the foundation. Depending on your needs, lifestyle, or wants, you will want to consider one of the below features.

Anti-snore button: Pressing the snore button raises the bed’s head slightly to open up the snorer’s airways, which decreases snoring and improves sleep.

Flat button: The flat button returns the adjustable bed to a flat position, so the user can get in and out of bed quickly.

Bluetooth: The electric bases have Bluetooth, so you can hook your bed up to an app on your phone and control the base—not remote control needed.

Wallhugger™ technology: Wall Hugging technology keeps the sleeper close to their nightstand without damaging the wall.

Zero-gravity position: Most adjustable bases are preprogrammed with a zero-gravity position, which raises the upper body and the legs slightly above the hips to alleviate all pressure points and increase blood flow.

Massage function: The Amerisleep adjustable foundation has a full body massage feature to encourage muscle relaxation.

An adjustable base comes with USB ports, under-bed lighting, ways to attach an existing headboard, adjustable legs, and white-glove services.

Some adjustable beds have micro hook or retainer bars to keep the mattress in place. While they both get the job done, micro hooks offer a luxurious modern finish but are sold at a higher price point.

If you don’t want all the bells and whistles or can’t spend $2000 or more on a foundation, you can find affordable adjustable bases around the $500 range with basic head and foot adjustment features.

FAQs

How do you keep two twin XL mattresses from separating?

To keep a two twin XL mattresses from separating, can attach bed straps to the bases of both mattresses, preventing the beds from sliding apart. Also, some manufacturers send iron plate connectors with split king mattresses to keep the twin XL bed together. Non-slip mattress pads can also create more friction between the bed and the foundation to prevent a gap between the mattresses.

Can you use two twin XL mattresses to make a split king mattress?

Yes, a twin XL mattress measures 38 inches wide by 80 inches long. Two Twin XLs placed side by side create a mattress with the same dimensions as a standard king, 76 inches wide by 80 inches long. If you have a twin XL mattress and want to form a split king bed by adding another mattress, you may do so. However, we suggest purchasing a new mattress if the existing twin XL bed is over 10 years old. Many brands offer a split king option that lets you purchase two twin XL mattresses together.

Are adjustable beds worth the money?

If you have a painful medical condition such as osteoarthritis, fibromyalgia, or any kind of back pain, an adjustable bed can give some relief. Even sleeping conditions, such as sleep apnea or insomnia, can improve by using an adjustable bed. A slightly elevated head will keep the airways open and make breathing easier.

What kind of sheets do you put on a split king bed?

Standard king size sheets can be used on a split king mattress. King size sheets will help keep the two twin XL mattresses together. Twin XL sheets can also be used on each side of the bed, but this will create two separate sleep spaces rather than one large one.

Do adjustable beds ruin mattresses? 

Most modern memory foam, latex foam, and hybrid mattresses can be safely used with an adjustable bed. However, innerspring beds do not bend as easily as foam beds, causing steel springs to break when used with an adjustable frame. Broken springs can lead to sagging and indentations that affect the support of the mattress.

Conclusion

Split king mattresses are a great option for people who need a defined sleeping space, need a different firmness than their partner, or those who wake up easily from motion transfer. Split king mattresses are great for people with adjustable beds. Remember to take a close look at the warranty, sleep trial, and return policy before you make your purchase.

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