9 Best Split King Mattresses For Side Sleepers in 2026

Two inches of GelFlex Grid cradles your hips and shoulders while keeping your spine aligned. That combination matters when you spend the night on your side. The air channels running through the grid draw heat away, so you don’t wake up sweaty, and the edge support foam keeps the mattress stable when you sit on the edge or climb out of bed.

The trade-off is a 9.2-inch profile, which is noticeably thinner than the 14-inch SlumberCool MAX 3Z Euro Top. That extra height in the SlumberCool comes from layers of gel memory foam and pocketed coils, so if you prefer a deeper, more traditional mattress feel, the Purple’s lower height might feel less substantial. But for side sleepers who want responsive support that doesn’t trap heat, the GelFlex Grid’s unique construction makes this a standout pick.

Side sleepers finally get a mattress that cradles without collapsing, thanks to the 1044 pocketed coils that lift the lower back while letting shoulders sink into the plush Euro top. The GlacierTex MAX Cooling Cover pulls heat away fast with 80% more cooling yarns, so hot sleepers stay noticeably cooler all night. It balances sink-in softness with zoned lumbar support, making it a strong fit for anyone who finds standard memory foam too warm or too firm.

At 115 pounds, this is a heavy mattress to maneuver when changing sheets or rotating, so you will want a partner or a sturdy base. Compared to the Purple GelFlex Grid Mattress at 9.25 inches and 100 pounds, the SlumberCool offers a thicker, plusher feel with dedicated cooling foams. But the Purple’s lower profile and lighter build are easier to handle. For side sleepers who prioritize pressure relief and temperature control over portability, this mattress delivers without the sinking feeling that plush beds sometimes bring.

A 12-inch profile with plush memory foam means this mattress sinks deeper around your shoulders and hips than a firmer bed, which is exactly what many side sleepers want for pressure relief. The foam is CertiPUR-US certified, the cover carries OEKO-TEX Standard 100 approval, and there is no fiberglass anywhere in the build. For someone buying a split king on a tighter budget, these certifications signal that the materials have passed third-party safety and emissions testing without the premium price tag of a name-brand alternative.

At 85.2 pounds per panel, moving the boxes into your bedroom will definitely require a second pair of hands. The 12-inch profile delivers plush cushioning on top while keeping support underneath, which reviewers say gives a deeper, more contouring feel for side sleepers. It’s built in the USA without fiberglass, and the foam carries CertiPUR-US and OEKO-TEX certifications, so you can feel good about what’s inside.

The TEMPUR-Adapt 2.0 Medium uses the brand’s exclusive TEMPUR-Material to conform closely to your body’s weight, size, and temperature, which means it can provide pressure relief for aches and pains. Its cool-to-the-touch knit cover helps offset the heat memory foam can trap, so you’re not waking up sweaty. This mattress suits anyone who wants deep, undisturbed rest with movement isolation to minimize disruptions from partners, pets, or kids.

The 11-inch profile of this mattress sits lower than the 14-inch SlumberCool MAX 3Z Euro Top, so if you prefer a taller bed, that model offers more height. But for anyone who needs precise contouring to ease aches and pains, the Tempur-Pedic’s pressure relief is hard to beat.

The GelFlex Grid immediately flexes to support your position and springs back as you readjust, which helps with pressure relief. Combined with a coil core that draws excess heat away, this 11.5-inch mattress aims to keep you cool and cradled without sleeping hot. It suits anyone who wants a plush, adaptive surface that still springs back into place when you change positions overnight.

The GelFlex Grid instantly flexes to support your position and springs back as you move, but at 114 pounds this split king is a two-person lift to set up. If you want a soft, temperature-neutral mattress that moves with you rather than against you, the effort is worth it.

A split king adjustable base paired with a 12-inch hybrid mattress means you get both head-and-foot articulation and a medium-firm gel memory foam sleep surface in one box. The head inclines to 55 degrees and the foot to 42, so propping yourself up to read or watch TV is straightforward. The massage function offers three modes and three intensity levels with a programmable timer. This set suits someone who wants the convenience of a complete adjustable system, frame, mattress, and remote, without shopping separate pieces. The adjustable legs let you set bed height between 8 and 11.4 inches, and the built-in USB ports and under-bed lights add practical bedside function.

Compared to the Purple GelFlex Grid Mattress, which uses a 2-inch GelFlex grid, this ESHINE set combines gel memory foam with coils for a medium feel. The adjustable base includes head and foot incline, massage, USB ports, under-bed lights, and a wireless remote, all in one box. At 89 pounds, assembly is reported to take under 10 minutes. Best for someone who wants a complete adjustable bed and mattress set with massage, USB ports, and under-bed lighting. Not ideal for those who need a plush sleep surface or prefer a softer mattress.

A 750-pound weight capacity means this split king set can handle two sleepers plus a restless night of position changes without straining the frame. The complete package pairs an adjustable base with a 12-inch hybrid mattress that uses 319 individually wrapped pocket springs under 2.5 inches of gel-infused memory foam. It offers medium support that suits a range of sleep positions. It suits anyone who wants an all-in-one adjustable setup without hunting for a compatible mattress later, especially if you value quick assembly and app-based adjustments over a longer bed length.

The 78.6-inch length is shorter than the 80- or 84-inch options from the Purple GelFlex Grid or SlumberCool MAX 3Z Euro Top mattresses. The medium feel is a middle ground that works for many, but those who prefer a very plush or very firm surface may want to consider other options. For the price of a coordinated system that arrives in four boxes and sets up in minutes, this is a practical, no-surprises choice for couples who want independent adjustability without the headache of matching components.

The 14-inch medium firm sleep bundle uses cooling gel-infused copper memory foam, a supportive transitional layer, and a durable base foam layer for balanced comfort and long-lasting support. The adjustable base lets you independently incline the head up to ~75° and the feet up to ~45° to find your sweet spot for open airways and less snoring. Dual massage motors with three intensity levels add a gentle way to unwind at the end of the day.

This mattress set weighs 100 pounds, making it a two-person job to set up or rotate. Compared to other split king mattress sets, this is noticeably more effort. But if you want a complete adjustable base with massage, USB ports, under-bed lighting, and preset positions like Zero Gravity and Anti-Snore, the Irvine Home Collection set delivers that convenience without needing to buy a separate frame.

At 274 pounds, this is a heavy unit to maneuver into a bedroom or up stairs, so you will want a helper. Still, if you value a single-box solution with lifetime warranty and a fiberglass-free cooling foam that does not require a separate base, this is a straightforward, fuss-free buy.