Spa Sensations 7.5" High Bi-Fold Box Spring: * Folding foundation compresses for easy mobility and storage * Designed to have the look of a traditional box spring * Even distribution of weight for spring or foam mattresses * No assembly required, simply open the box, slide the foundation out and unfold, it will immediately open to the shape of a box spring * Passed all durability testing including the Cornell, Rollator and Impact tests * Steel frame with fabric cover * 1-year limited warranty * Dimensions: * Twin: 74"L x 38.5"W x 7.5"H * Full: 74"L x 53.5"W x 7.5"H * Queen: 79"L x 59.5"W x 7.5"H * King: 79"L x 37.5"W x 7.5"H (set of 2) * Beds sold separately. See our assortment of beds. * Bed frames sold separately. See our assortment of bed frames.