I have always found mattresses interesting because the differences between models are not always obvious from the outside. 2 mattresses can both use memory foam but they feel completely different once you spend a full night on them. The biggest issue with traditional memory foam is heat retention, and that is where the CoolNest Ultra Memory Foam Mattress tries to fix.
Rather than treating cooling as an extra feature, CoolNest® Ultra makes it a central part of the sleep experience. It combines Advanced Cooling with Advanced Support, aiming to create a mattress that feels comfortable when I first lie down and remains supportive and balanced throughout the night. The result is a more thoughtfully engineered take on the traditional memory foam mattress.
The CoolNest Ultra is available in 12-, 14-, and 16-inch versions, although the available sizes are currently limited to Queen and King. Pricing ranges from $729.99 to $1,029.99, depending on the size and thickness. The 12-inch model has a medium firmness, while the 14- and 16-inch versions are described as medium plush. This gives shoppers some flexibility depending on whether they prefer a more supportive feel or a softer, more cushioned mattress.
Of course, the most interesting feature here is the 5-stage cooling system. SweetNight says CoolNest® Ultra delivers up to 11° cooler sleep comfort compared with a traditional memory foam mattress. Instead of depending on one cooling material, the system combines an Ice Silk Cover, PCMflux High Resilience Foam, Ventilated Gel Memory Foam, AirMesh Breathable Memory Foam, and a breathable open-channel structure. I think this layered approach makes more sense than simply making the surface feel cool for a few minutes, because the goal is to manage heat and airflow throughout the night.
The Ice Silk Cover is designed to create a cooler, more comfortable first contact with the mattress while allowing heat and moisture to escape. Beneath it, PCMflux foam uses phase-change material to absorb, store, and release heat as needed. SweetNight says it contains twice as much PCM and gel particles and uses a large-pore structure for 3× greater breathability. These details help explain how the cooling system is intended to work as a whole rather than as a collection of unrelated specifications.
The next layer adds even more ventilation. The Ventilated Gel Memory Foam contains a 30% gel infusion and more than 700 ventilation channels. The gel is designed to absorb body heat while the vents help move that heat away. This is important because memory foam can otherwise create a warm, enclosed feeling, particularly for people who naturally sleep hot.
Another interesting component is AirMesh Breathable Memory Foam. Its hollow-mesh structure is designed to provide up to six times greater breathability than traditional closed-cell memory foam while retaining the contouring and pressure-relieving characteristics associated with memory foam. Combined with the other ventilated layers, the mattress creates what SweetNight calls a 3D open-channel breathable structure.
Cooling is only useful if the mattress is comfortable, and CoolNest Ultra also puts considerable emphasis on support. Its 7-zone ergonomic support foam uses a wavy-cut design to provide targeted support for the head, shoulders, back, waist, hips, legs, and feet. The idea is to distribute body weight more evenly and encourage natural spinal alignment while reducing pressure points.
The mattress also includes a high-density support base intended to reduce sagging and compression over time. An anti-slip dotted fabric on the bottom helps minimize movement against the bed frame. The all-foam construction also helps isolate motion, so a partner’s tossing and turning is less likely to travel across the bed. These are relatively practical details, but they matter because a mattress can have impressive comfort features and still be frustrating if it shifts or loses its support. I also like that the CoolNest Ultra uses OEKO-TEX-certified fabric and CertiPUR-US-certified foams, which is fiberglass-free.
Based on its design, I see the CoolNest Ultra being particularly appealing to hot sleepers, people who tend to sweat at night, side sleepers who need pressure relief, and couples who want a comfortable memory foam mattress without as much heat buildup. SweetNight also positions it for athletes and active individuals, plus-size sleepers, and people who are easily disturbed by movement during the night.
Overall, the CoolNest Ultra takes a different approach from a basic memory foam mattress by making temperature management one of its central design priorities. This alone makes the mattress worth considering for a more comfortable night’s sleep.
