Gel Memory Foam Sofa Sleeper Mattress Size Queen60x72x4.5 Gel Memory Foam Sofa Sleeper Mattress Size Queen60x72x4.5 Top layer: 1.5 inches of (3 lb density) Gel Infused Memory Foam Base layer: 3 inches of HD Support Foam Combines conforming gel-infused memory foam with a high density foam base. Our mattress will easily support two 250-pound adults without feeling the bar. The Every Night Sofa Mattress. Warranty: 10-year manufacturer's warranty.