Our dorm-friendly extra-long mattress topper adds a layer of cozy comfort for a good night's sleep. Topped with a quilted 300-thread-count cover, the pad accommodates extra-long twin mattresses up to 17 inches in depth. The mattress topper is made with hypoallergenic fiber and adds a luxe 2 1/2 inches of extra support. Edge-to-edge baffling keeps the fill equally distributed.