CoolNest® Ultra Memory Foam Mattress

The CoolNest® Ultra is engineered to feel up to 11° cooler than a traditional memory foam mattress. Powered by the Advanced CoolNest® Ultra System, its 5-Stage Cooling Design combines a Gradient Ice Silk Cover with a Qmax of 0.25 J/(cm²·s) for an instant cool-to-the-touch feel, PCMflux® high-resilience foam that absorbs and releases heat as your body temperature changes throughout the night, AirMesh™ breathable memory foam, a ventilated gel memory foam layer, and a 3D open-channel breathable structure that promotes continuous airflow and carries trapped heat away from the mattress for cooler, fresher sleep.

AirMesh™ Breathable Memory Foam is SweetNight's proprietary open-channel breathable memory foam, engineered to deliver up to 6× greater breathability than traditional memory foam. It promotes continuous airflow and faster heat dissipation while maintaining the adaptive contouring and pressure-relieving comfort of premium memory foam. As a key layer of the Advanced CoolNest® Ultra System, it helps keep your sleep cooler and fresher throughout the night.

Yes — cooling is the reason the Ultra exists. The Gradient Ice Silk Cover (Qmax 0.25) feels cool the moment you lie down and helps wick away heat and moisture from the surface. Beneath it, PCMflux® phase-change foam absorbs excess heat as your body warms and releases it as you cool, helping maintain a more consistent sleep temperature throughout the night. A ventilated gel memory foam layer with precision airflow channels further enhances airflow and heat dissipation, while AirMesh™ breathable memory foam and the 3D Open-Channel Breathable Structure continuously carry trapped heat away from the mattress to deliver a cooler, fresher sleep experience.

Yes — cooling is the reason the Ultra exists. The gradient ice silk cover (Qmax 0.25) feels cool the moment you lie down and wicks moisture off the surface. Beneath it, PCMflux® phase-change foam absorbs excess heat as your body warms and releases it as you cool, which flattens out the temperature swings that wake people up sweating. AirMesh™ foam and the 3D open-channel structure then vent that heat out of the mattress rather than letting it pool. It's the coolest mattress SweetNight makes.

The CoolNest® Ultra is available in two comfort levels depending on mattress height: the 12-inch model offers a Medium feel, while the 14-inch and 16-inch models provide a Medium Plush feel. The thicker models feature a more cushioned comfort surface paired with a thicker high-density support foam base, delivering enhanced pressure relief while maintaining stable, full-body support. Combined with the 7-zone contour-cut support design, each model helps promote proper spinal alignment and balanced comfort. The 12-inch model is ideal for sleepers who prefer a more balanced feel, while the 14-inch and 16-inch options are better suited to side sleepers or anyone seeking a softer, more cradling sleep experience without excessive sinking.

Not yet — the CoolNest® Ultra currently comes in Queen and King, in 12", 14", and 16" thicknesses. Twin and Full are joining the lineup this November and are expected to be available in time for our Black Friday mattress sale, so if you can wait, that's the moment to buy. Join the waitlist and we'll email you the day they go live, along with early access to Black Friday pricing. If you need a Twin, Twin XL, Full, or California King sooner, the CoolNest® Memory Foam Mattress is available in those sizes today and delivers the signature CoolNest® cooling comfort at a more accessible price.

The CoolNest® Ultra is backed by trusted certifications. All foams are CertiPUR-US® certified, meaning they're made without ozone depleters, heavy metals, formaldehyde, or prohibited phthalates, and are tested for low VOC emissions. The Gradient Ice Silk Cover is OEKO-TEX® STANDARD 100 certified, with every component tested for substances harmful to skin. The mattress is also recognized by the American Chiropractic Association (ACA) for its ergonomic support and sleep-focused design.

Yes. Sleep on the CoolNest® Ultra for 100 nights. If it isn't right, contact us for free pickup and a full refund — no return shipping cost. We do recommend giving it at least 30 nights, since it takes most people a few weeks to adjust to a new support system. Returned mattresses are donated to local charities. The Ultra also includes a 10-year warranty covering sagging over 1.5 inches.