Serta iComfort Directions Acumen Queen Size Mattress ThermoCool Yarn Fabric Cover with TENCEL is an exceptionally soft material designed to help optimize heat and moisture flow at the sleep surface. ThermoCool high performance yarns are designed to help enhance the moisture wicking capability of the fabric. Plus, TENCEL fibers can resist the growth of mold, bacteria and dust mites. - TWO layers of EverCool GfX Memory Foam is the worlds first premium, breathable memory foam featuring a super-fine infusion of heat-conducting graphene for supple, body conforming comfort and an extra ability to whisk heat away from the body. This new material has up to 25% more heat dissipation ability than Sertas original Kool Comfort memory foam. Cool Action Dual Effects Gel Memory Foam is the worlds first dual-action gel memory foam infused with both Sertas original MicroSupport gel and our new MicroCool+ gel. This unique and exclusive design works to provide more support where your body needs it and gives the material an enhanced ability to transport heat away from the mattress layers above it. Heres how it works: millions of Sertas original MicroSupport gel beads gather under the areas of your body that need extra push back support. Meanwhile, our new MicroCool+ gel features advanced phase change material encapsulated in a proprietary gel designed to efficiently capture, store and ultimately dissipate heat away from the mattress layers above. Pods Gel-Activated Support Strategically positioned macro-gel discs work with our ComfortLast Foam Core support system to help provide extra push back support from the deepest part of the mattress and a firmer seating edge.