High performance support base offers extraordinary comfort and unparalleled orthopedic support. This base is a higher grade (anti-microbial) version of polyurethane foam. Also, the extra strong support base will ensure that the bed never sags or flattens out. If you intend to use this mattress in your dorm room, please note that you are still responsible for the existing mattress in the room - make sure it is back in place when you move out to avoid an additional charge.