Today’s high quality mattresses were designed to perform with a sturdy non-yielding foundation system. The EnForce Platform Base provides complete mattress support system which acts as a box spring/foundation and bed frame. This stand alone platform bed is easy to assemble and ships in a small box. Upholstered like a real foundation, the legs can be removed and used in a traditional bed set or metal bed frame or used as a stand alone piece of furniture. California King Sized.