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A mattress pad, mattress topper, or underpad is designed to lie atop a mattress. Made from a variety of materials such as wool, cotton, memory foam, feather or latex, its function is to provide an extra layer of comfort, especially when the existing mattress is worn or uncomfortable.
Physically, it is a thin mattress, usually 5–10 centimetres thick. Stand-alone mattresses of this size exist. But mattress toppers are usually sold for use on top of boxsprings. They are used to extend the life of the more-expensive boxspring, make a bed warmer or cooler , make a firm bed softer, and for travel and dorms, as they are portable, especially if they are low-density.
Like a mattress protector/mattress pad/mattress cover , mattress toppers can be used to protect the mattress from the sleeper or vice-versa. Some mattress toppers are machine-washable; covers and fillings are made from a range of materials.