Built-in, recessed fast-fill pump inflates and deflates. Inflates in less than 4 mins. 19-1/2 in height provides the feeling of sleeping on a "real bed". Inflated dimensions fit standard sheet sizes. Luxurious flocking prevents sheets from slipping. Combination I-beam/wave beam construction is patterned after the traditional mattress and box spring system. Built-in pillow for extra comfort and convenience.