Bladder Waterbed Durable and Long-lasting. Only high gauge, top grade virgin vinyl material is used in the construction of this bladder waterbed. Furthermore, all corner seams - the points of greatest pressure - are reinforced. Superior Edge Support. 1.8 lbs density sloped wall foam rails maximize side support against the pressure of the water bladder, preventing the bed from bowing out. In addition, high strength stitch bond fabric connecting the rails holds the bed components firmly together from head to toe. Superior Base Support. This waterbed sits on an 8" Waterfall Foundation that is especially reinforced and designed for the Supreme. Premium Split foundations are stadard on all Queen and King beds.