InnerSpace 5-inch Bunk Bed/Dorm Reversible Twin XL Mattress. Composed of 5-inch high density polyurethane foam. Includes a durable, stain resistant polyester cover in a decorative, balloon design pattern. The mattress relieves soreness associated with pressure and distortion during sleep and eliminates motion transfer between bed partners. The 80L x 38W x 5H Twin XL Mattress can be used with ...