Brand-new twin mattress: Medium firm hybrid Ashley mattress. Stored in smoke-free, pet-free home. Does not require a foundation. 12" height High-denisty super soft quilt foam flame-retardant polyester comfort fiber High-density gel memory foam lumbar support 1" upholstery grade comfort support foam 2 perimeter rows of 9" 13-gauge pocketed coils for edge-to-edge support