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A mattress is a piece of bedding on which to sleep or lie. In the United States it is typically constructed of multiple layers of foams, natural and/or synthetic fibers, and springs. A mattress can be used alone, on the floor, but is usually placed atop some platform so as to be higher off the ground. Such a platform might be a foundatio n made with metal springs in a wooden frame. Mattresses made mainly of foam materials such as latex foam, viscoelastic foam and other polyurethane-t ype foam, are becoming more common. Mattresses can be constructed to use almost any support system such as air, water, foam, or springs. If a mattress is permanently covered in fabric, this fabric is normally called the ticking.
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