Abstract: A hybrid water bed mattress construction having a thickness similar to conventional mattresses and having a peripheral restraining foam member to provide a lateral support in all directions and a flexible bladder for holding a body of water is disclosed. Construction generally includes a stacked, two-layer foam restraining member or members having a height of at least as great as the bladder when said bladder is filled with water, typically with the lower foam layer being a tough polyethylene foam material.

Abstract: A composite water bed mattress construction having a thickness similar to conventional mattresses and having a peripheral restraining member to provide a lateral support in all directions with a foam member interposed between said restraining member and a flexible bladder for holding a body of water is disclosed. Construction generally includes an intermediate foam restraining member or members having a height of at least as great as the bladder when said bladder is filled with water. Also, a foam cushion is superposed upon the peripheral restaining member and generally overlying the intermediate foam member to provide an outer peripheral surface for the mattress which is comfortable to sit upon.