The Relaxation has a helical laced 336 innerspring core that is foam encased. Foam encasement allows for a greater sleeping surface. It is upholstered with generous layers of foam for extra comfort, creating a plush sleeping surface. It contains internally made Wolf bonded center third posture pad for extra support in critical :middle". It provides Plush support and is 12" high +/- .75". It is covered in a luxury stretch knit quilt fabric for conforming comfort. Manufactured by Wolf Corporation the oldest mattress manufacturer in the United States under continuous family ownership! First in the industry to provide foam encasement that is rollable. Very competitive prices! All mattresses are compressed, rolled, boxed and shipped for ease in shipping and installation!