Sewing: Double-stitched reinforced seams. PVC coated terylene laminated oxford terylene,powered by strong blower,easy set up and take down,inflates in less than a minute. Huge play area providing large space to accommodate 5 children under total 800 pounds; mattress giving enough air pressure, better jumping ability! Big size: 485x230x223cm, with slide, a large bouncing area, ideal for a birthday party, family reunion, or for any occasion to keep the kids entertained as they bounce around in the moonwalk. High quality material and made by commercial grade sewing meet requirements of rental at some degree, although it is a residential bounce house.