The Best Split King Mattress of 2025

Nolah’s Evolution 15 is designed to maximize pressure relief without trapping too much heat. The hybrid is notable for its plush Euro-top that gently massages pressure points. Co-sleepers can choose from three firmness levels, which Nolah calls Plush, Luxury Firm, and Firm. Our testing team found that these options correspond to medium (5), medium firm (6), and firm (8) on our 10-point firmness scale.

Why We Like It

We found that the Plush option performs especially well for side sleepers under 230 pounds, while heavier side sleepers preferred the Luxury Firm model. The thick comfort system delivers plenty of cushioning to the hips and shoulders, which are vulnerable pressure points for side sleepers.

Back sleepers on our testing team between 130 and 230 pounds were evenly split among proponents of the Luxury Firm and Firm options. But those over 230 pounds clearly preferred the greater support of the Firm mattress, while those under 130 pounds liked the added contouring of the Luxury Firm. Many stomach sleepers also said they could go either way, but those with bigger bodies mostly opted for the firmer of the two.

Thanks to a number of cooling features, we found that the mattress regulates temperature well. While the comfort system is fairly thick, the foam layers are more breathable than conventional foam. The pocketed coils promote airflow, and their added bounce keeps sleepers from sinking too far into the mattress.

The Nolah Evolution 15 comes in all the standard mattress sizes, as well as a split king option that lets co-sleepers choose between the three firmness levels for each side of the mattress.

We found that the Nolah Evolution 15 delivers notable pressure relief for most sleep styles and body types. The mattress also has above-average temperature control thanks to breathable foams and pocketed coils.

How Does It Feel?

Using proprietary ArcticTex fibers, the quilted cover is engineered to dispel heat. The Euro-top contains breathable polyfoam, which also helps the surface stay cooler. Two additional layers of polyfoam support spinal alignment by evenly distributing body weight, while graphite infusions are designed to minimize heat retention.

A pocketed coil system limits motion transfer while encouraging air circulation. The coils are zoned so that the torso area receives extra reinforcement. Sturdier coils along the perimeter boost edge support, which minimizes gapping in the center of a split king mattress. A base layer made from recycled plant fibers stabilizes the entire mattress.

The sides are encased in embroidered fabric and feature convenient carrying handles. The seven layers total 15 inches, so fitted sheets with extra deep pockets may be needed.

The Nectar is an affordable all-foam model that cradles the body to alleviate tension. Its balanced medium firm feel registers as a 6 on our 10-point firmness scale and supports a range of sleep styles.

Why We Like It

The Nectar’s pliable all-foam design makes it well suited for couples with adjustable bases who like having the option of raising or lowering the head of the bed on each side independently. Along with split king, the Nectar is available in the six standard mattress sizes.

We found the Nectar to be a great budget-friendly option for side sleepers and people under 230 pounds. It also sleeps relatively cool for an all-foam mattress and features top-notch motion isolation and pressure relief.

How Does It Feel?

Made from a blend of polyester and nylon, the soft cover helps wick away heat and moisture. Plush memory foam cushions areas prone to pressure points on the hips, shoulders, and spine. Close contouring foams tend to trap heat, but the Nectar uses gel infusions designed to increase breathability.

A layer of adaptive polyfoam helps spread body weight evenly across the mattress. The support core uses 7 inches of high-density polyfoam to reinforce the upper layers. A slip-resistant base cover helps keep the mattress firmly rooted. The foam layers amount to 12 inches, which is an average mattress height.

Side sleepers often benefit from a foam mattress’ closer contouring. Unsurprisingly, we found that the Nectar delivers ample pressure relief to side sleepers in any weight group. The plush memory foam cradles the hips and shoulders while encouraging good sleep posture. Most stomach and back sleepers should feel supported by the dense polyfoam core, but sleepers over 230 pounds may experience some sinkage and find it more difficult to change positions.

As an adjustable airbed, the Saatva Solaire gives couples maximum customization. The queen size and larger models have 50 firmness settings on each side of the bed so sleepers can experiment with various levels of support.

Why We Like It

With a range of nuanced settings, we found that the Solaire delivers balanced support and pressure relief for the full gamut of sleep positions and body types. Our tests also revealed excellent temperature control and above-average ease of movement and durability.

While the Solaire doesn’t come in twin size, it’s available in the other standard sizes as well as split king and split California king. Customers can test the bed for 365 nights, which is longer than the average sleep trial.

While the Solaire may be cost-prohibitive for some shoppers, a durable design, professional installation, and a lengthy sleep trial help justify its higher price-point for couples seeking a luxury airbed with a wide range of personal customization.

How Does It Feel?

A 3-inch quilted Euro-top boosts pressure relief without trapping too much heat. The layer is sturdier in the center so that the back and hips receive extra support. An organic cotton cover is designed to draw heat away from the mattress’ surface. The cover incorporates Guardin, Saatva’s exclusive antimicrobial treatment.

Zoned Talalay latex conforms to the body while still supporting the heavier torso area. A layer of gel-infused memory foam offers deeper contouring without generating too much heat. The comfort system is finished with a protective barrier that safeguards the mechanical core from moisture.

The support core features vulcanized rubber air chambers that inflate or deflate via remote control. Foam lining stabilizes the core and dampens any noise from the chambers. The 50 settings span from soft (3) to firm (8), so users can finely calibrate their comfort level.

Brooklyn Bedding’s Signature Hybrid balances quality and affordability to provide comfort at a fraction of the average hybrid cost. The versatile design makes it well suited for co-sleepers with different sleep preferences.

Why We Like It

The Signature Hybrid comes in three firmnesses. Our side sleepers who weighed under 130 pounds preferred the medium soft (4) feel. The medium firm (6) option appealed to testers across all sleeping positions, and the firm (8) option was popular with testers who weighed over 130 pounds. Our combination sleepers in that same weight range found it particularly comfortable.

Our tests showed that the thicker polyfoam comfort layers in the medium soft and medium firm versions help isolate motion, making these options a good solution for partners trying to avoid disturbing each other when they toss and turn. However, the firm version’s sturdy build provides better edge support and allows for easier movement overall. If you move a lot in your sleep or have trouble getting into or out of bed, the firm option may be the best fit for you.

How Does It Feel?

A quilted polyfoam layer cradles the body to relieve pressure in the hips and shoulders, followed by another polyfoam layer that feels more responsive. Beneath, a transitional layer of responsive polyfoam acts as a cushion between the comfort system and the support core. A pocketed coil core limits motion transfer, adds bounce, and provides even support. Zoned coils around the perimeter reduce edge sinkage so you can use the full surface of the mattress. Good edge support also makes it easier to get into and out of bed.

Bear designs mattresses with athletes in mind, but a variety of sleepers can benefit from solid pressure relief and support. The Elite Hybrid features thick comfort layers and a sturdy coiled core to ease pressure points and align the spine. With more firmness options than other Bear models, the mattress accommodates couples with distinct preferences.

Why We Like It

Given the different firmness options, we found that the Elite Hybrid can comfortably sleep all positions. The coiled core allows sleepers to change positions with greater ease, but we didn’t notice significant motion transfer. We also found that the mattress regulates temperature well, despite its close-conforming memory foam.

While Bear doesn’t let shoppers select two different firmness options on a single split king purchase, co-sleepers with differing firmness preferences can order two twin XL mattresses since the combined dimensions are identical to the split king size.

With three firmness options to choose from, people of most body types and preferred sleep positions should enjoy considerable pressure relief and support on the Elite Hybrid. Hot sleepers can also benefit from the mattress’ various cooling features.

How Does It Feel?

A plush, hand-quilted cover blends phase change material with cooling Celliant fibers. Cushy memory foam contours the body, while copper infusions are engineered to reduce heat buildup. A layer of zoned polyfoam delivers proportional support so heavier areas like the torso and hips receive more pushback. Cutouts in the foam are designed to promote air circulation.

The pocketed coil core boosts lumbar support and stabilizes the comfort system. Sturdier coils are used along the perimeter to enhance edge support, and a base of high-density polyfoam adds further stability.

All sizes are available in three firmness levels: medium (5), medium firm (6), and firm (8). At 14 inches thick, the mattress is considered high-profile.

If you live with frequent or chronic back pain, you should use a mattress that promotes even alignment and provides adequate support for your body. Each layer of the PlushBeds Botanical Bliss is composed of organic latex, a naturally durable and responsive material that gently cushions the body. Latex is ideal for people who dislike the “hug” of memory foam, or find that they sink too much on all-foam mattresses.

Why We Like It

During our tests, we found the Botanical Bliss sleeps quite cool. The latex is ventilated to promote airflow throughout the interior and the cotton is exceptionally breathable. We also awarded positive ratings for ease of movement. The natural, gentle bounce of latex allowed us to move across the Botanical Bliss’ surface without sinking or feeling restricted.

The PlushBeds Botanical Bliss is a long-lasting, eco-friendly latex mattress that offers decent cushioning without the body-hug or sink of foam. Excellent cooling also makes the Botanical Bliss a good pick for hot sleepers.

How Does It Feel?

You can choose between two firmness levels for your Botanical Bliss, medium firm (6) and firm (7). The latter feels slightly more supportive and the former provides closer contouring, but both feel fairly balanced. If you and your partner have different preferences, you can opt for a split king with medium firm on one side and firm on the other.

The Botanical Bliss is also available in three profiles. The 9-inch model consists of bouncy Talalay latex over two base layers of dense Dunlop latex. This profile is best suited to people who weigh up to 230 pounds. If you weigh more, then the 10-inch or 12-inch model should provide sufficient support. The 12-inch design includes a third Dunlop latex layer for maximum reinforcement.

All Botanical Bliss models are encased in organic cotton covers. This fabric has earned certification from the Global Organic Textile Standard, ensuring sustainable cultivation and processing. Likewise, the latex holds certification with the Global Organic Latex Standard for eco-friendly sourcing of rubber tree plants used to produce the material. These credentials should appeal to anyone who prefers to buy and use products with minimal environmental impact.