Also referred to as a “foundation.” A base for an innerspring mattress, consisting of coils or other forms of springs mounted on a wood or metal frame and secured with a wire-interlaced or welded-wire grid, topped with upholstery and insulating materials (felt, urethane or other resilient materials), and covered on the top and sides with ticking and on the bottom with a dust cover. It is an important part of a bed set since it serves as a shock absorber, distributes weight, and supports and interacts with the innerspring mattress to properly support the body.
