Serta Hemmons Gel Memory Foam Low Profile Mattress Set, Full, White The Serta Perfect Sleeper is the Only Official Mattress of the National Sleep Foundation (NSF), designed to help address 5 common sleep problems Ever Cool Memory foam: the unique open-cell structure of Serta's exclusive and breakthrough foam makes it more breathable, to dissipate heat away Custom Support System: A durable, yet flexible all-foam support system is engineered to provide the right amount of support across the entire body Mattress Set includes Serta Perfect Sleeper Low Profile 6" Stable-Base Foundation Set measures 74.5 inches long by 53 inches wide by 18 inches high; 10 year manufacturers warranty