HYBRID MATTRESS: Hybrid mattress combines the best of wrapped-coil innersprings and memory foam, offering the ultimate sleeping experience; Color: White; (L x W x H): 80 x 39 x 10.5 inches; Weight: 55 pounds 4-LAYER SUPPORT: 4 layers makeup mattress support: memory foam, comfort foam, wrapped innnerspring, and high-density base MEMORY FOAM: Open cell memory foam allows for increased circulation so you don't overheat while contouring to your body shape for maximum comfort WRAPPED COILS: 6-inch wrapped coils encased in separate pockets enables them to move independently and reduce movement while providing orthopedic support MEDIUM-FRIM FEEL: Quilted knit cover with a corded edge and knit sides for breathability and medium-firm, cushion feel; Meets CertiPUR-US program standards for performance, emissions, and durability; Size: Twin XL Top:Stretch Knit