Experience comfort and deep sleep like no other with the Posturepedic Plus Livermore Valley cushion firm mattress that sets the bar high when it comes to allover support. quilt layer: FlameGuard" fiber; 2x1/2" SealyCushion" ultra-soft foam comfort layers: 1" SealyCushion extra-soft foam; 1" SealyCushion soft foam; " SealyCool" gel memory foam; " SealyCool gel memory foam center 1/3 innerspring system: Sealy Embrace" Plus coils; SolidEdge HD System premium knit fabric cover twin mattress: 74x38x11"H; 496 coil count twin xl mattress: 79x38x11"H; 528 coil count full mattress: 74x53x11"H; 682 coil count queen & split-queen mattress: 79 x60x11"H; 825 coil count king mattress: 79x76x11"H; 1056 coil count cal. king mattress: 83x72x11"H; 990 coil count made in America Set includes mattress plus box spring/foundation. Foundation measures 9"H; mattress set measures 20"H when stacked. Split Queen, King and Cal. King mattress sets feature 2-piece side-by-side foundations for easier navigation in tight spaces. You can purchase this mattress without a box spring, but your best value is to buy the set together. The matching box spring is specially designed to provide support, absorb shock and reduce wear to the mattress. You'll sleep more comfortably, and your new mattress will last longer.