7" Gel Memory Foam Mattress & New Innovative Box Spring Set - Full Size Sleep cool layering system-1" Gel Memory foam, 2" of Pressure Relief Foam. Base support layer of 4" high density foam to provide long lasting durability and stability. The comfort of your sleep environment is balanced with ingredients that are safer for you and the environment we all share. 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. Bi-fold box spring simply unfolds and you lay your mattress on top; The steel frame provides maximum edge firmness