DURABLE COMFORT – When soft, yet durable foam layers combine with steel innersprings, a match made in mattress heaven happens, resulting in a supportive spring mattress with the right hint of conforming softness TOP QUALITY LAYERS - .5 inch durable high-density foam, 1 inch conforming ViscoLatex foam, and a 6 inch base layer of heavy duty steel coils; ideal for stomach sleepers and petite to average weight individuals CERTIPUR US CERTIFIED - Highest quality foam is CertiPUR US Certified for durability, performance, and content EXPERTLY PACKAGED - Our technology allows this mattress to be efficiently compressed into one box that’s easily shipped and maneuvered into the bedroom; simply unbox, unroll and this mattress does the rest, expanding to its original shape within 72 hours Worry-free 10 year lid warranty included; twin mattress supports a maximum weight of 250 lbs, while all other sizes can support up to 500 lbs