Featuring a tight top, this mattress set delivers superior all-over support, along with the comfort you need for relaxing sleep. classic coil innerspring system cover is polyester/polypropylene quilt: FlameGuard" fiber; " Hypersoft" foam; 1" x " conversion Hypersoft" foam comfort layers: 3" SealyFoam"; " SealyFoam"; " gel memory foam center SolidEdge" HD system Stable Support" foundation twin: 38x74x12"H; 378 coil count twin XL: 38x79x12"H; 406 coil count full: 53x74x12"H; 513 coil count queen/split queen: 60x79x12"H; 638 coil count king: 76x79x12"H; 812 coil count cal. king: 72x83x12"H; 806 coil count made in America Your mattress is created exclusively for you only after you order it, then delivered directly to you. Set includes mattress plus box spring. Box spring measures 9"H; mattress set measures 21"H when stacked. Split queen mattress set features a 2-piece side-by-side foundation 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.