Sleep cool layering system-2.5" Gel memory foam, 1" premium memory foam, 3" of Pressure Relief Foam. * Base support layer of 5.5" high density foam to provide long lasting durability and stability. * Infused with refreshing gel, it provides you with coolness and ultimate support. Gel is an open cell memory foam with thousands of gel beads for better air flow movement * Combined with our Pressure Relief system, you will enjoy total relaxation, while having the ultimate support in key body parts; head, shoulders, and hips. * Completed Mattress Set - No Box spring needed