An Advanced Cooling Sleep Solution for Restorative Sleep. Advanced CoolNest® Ultra System Feels Up to 11° Cooler. Gradient Ice Silk Cover Delivers Instant Cooling (Qmax = 0.25). PCMflux® Foam Actively Balances Temperature Throughout the Night. AirMesh™ Foam Delivers 6 × Breathability and Continuous Heat Dissipation. Refined 7-Zone Support Promotes Alignment and Relieves Pressure.