mattress

thumb|300px|Two-sided, innerspring pillow-top mattress on box-spring foundation with a woven damask cover also called a mattress sheet

A mattress is a large, usually rectangular pad for supporting a person lying down, especially for sleeping. It is designed to be used as a bed, or on a bed frame as part of a bed. Mattresses may consist of a quilted or similarly fastened case, usually of heavy cloth, containing materials such as hair, straw, cotton, foam, rubber, or a framework of metal springs. Mattresses may also be filled with air or water.