Featuring a tight top, this firm mattress sets thick memory foam and encased coils give you added comfort and all-over support throughout the night. 825 Sealy Embrace" innerspring system plus encased coil cover is polyester/polypropylene quilt: FlameGuard" fiber; 2" x " Hypersoft" foam comfort layers: 1" high-performance SealyFoam"; 1.5" SealyFoam"; " SealyCool" gel memory foam center SolidEdge" HD system Stable Support" foundation twin: 37x74x11"H; 496 coil count twin XL: 37x79x11"H; 528 coil count full: 53x74x11"H; 682 coil count queen/split queen: 59x79x11"H; 825 coil count king: 75x79x11"H; 1056 coil count cal. king: 71x83x11"H; 990 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 20"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.