Serta Perfect Sleeper Super Pillow Top Mattress Innerspring, Queen Gel Comfort XD foam: Extra deep layer of soft yet supportive foam that gently cradles the body to help provide enhanced pressure relieving comfort Continuous support innerspring with reinforced edge: Promotes proper back support and undisturbed sleep by combining continuous coil design Pillow-fill, fire blocker fiber, and Serta pillow soft foam - super pillow top the super pillow top mattress offers an additional upholstery layer The Serta perfect sleeper is the only official mattress of the national sleep foundation (NSF) 10 year manufacture warranty, made in the USA mattress only option to add box spring after purchase