To celebrate America's 250th Anniversary, this special, limited-edition Therapedic mattress is available in limited quantities. Circular Stretch Knit Fabric with Lycra provides a snug, breathable, comfortable fit and helps to protect the mattress from wear and tear, spills and allergens. TheraCool Gel Quilt Foam provides maximum comfort and greater pressure relief with the added benefit of wicking away heat from the body for a cooler, more restful and deeper sleep. Memory Touch Visco Foam provides conforming support to your body shape, while reducing pressure points. TheraSponse Medium and Firm Foams provide excellent support, extreme durability and comfortable sleep surfaces for years. Foam-Encased 758 TheraWrap V-Coil Wrapped Coil Unit features an individually wrapped coil design for optimal support, superior articulation and comfort.