A mattress is a large, usually rectangular pad that is used to support a person who is lying down. It is intended to be used as a bed or as part of a bed frame. A quilted or similarly fastened case, usually made of heavy cloth, may contain materials such as hair, straw, cotton, foam rubber, or a metal spring framework. Air or water can also be used to fill mattresses.
Mattresses are typically made to meet market-specific bed sizing standards. In terms of width, height, and depth, mattress sizes vary according to national standards. To represent these dimensions, many countries use non-numerical labels such as "King," "Queen," "Double," "Full," or "Single."