A bet itself is actually a collection of items that are designed to produce a sleeping quarters for an individual. The bed frame, usually made out of metal, is designed to support the box spring. The box spring in turn supports the mattress which the individual lays on. Typical mattresses consist of a series of metal springs designed to support the body while sleeping, however have increasingly become obsolete as newer technologies replace the conventional metal beds. Companies like TempurPedic offer mattresses made out of special material that is designed to support the body without the use of springs or the leaks a water mattress may cause.