This is a great product with just one flaw. The back, front and sides of the foundation, need a small stop placed in those areas. In other words the mattress will shift to and fro because there is no stopper mechanism or lip to keep the mattress from shifting in its place. A small indiscreet plate mounted to the side, back n front railing/support. Also the distance between the metal wires cause the mattress to dip or belly. Too wide of a distance between the wiring. So if you have a medium mattress it now feels soft. If you have a firm mattress it now is a medium. If the manufacturer could place the wiring closer together the problem is solved....