iComfort Directions Reinvention King Size Mattress by Serta Quliting layers: Mattress type: Memory foam layers of EverCoolTM Gfx Memory Foam is super breathable & features an infusion of heat-conducting graphene material that provides conforming comfort & wicks heat away from body More quilting layers: PodsTM gel-activiated support layer & Comfortlast Foam provide extra support & a firmer seating edge Comfort layers: Cool ActionTM Dual EffectsTM Gel Memory Foam provides support where you need it most & transports heat away from the layers above it Edge construction: Ultimate Edge Support strengthens mattress edges and reduces the annoying roll-off so you have more room to stretch Additional features: Cool ReactionTM Slow Recovery Latex Foam responds instantly to conform & support your body, while avoiding a "springy" feeling