. "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\u201310 centimetres (2\u20134 in) thick. Stand-alone mattresses of this size exist, including futons, and floor beds. Similarly, traditional European beds were made of a stack of mattresses of this size. In contrast, mattress toppers are usually sold for use on top of boxsprings (secured with straps or elasticated cloth corners). They are used to extend the life of the more-expensive boxspring, make a bed warmer or cooler (with airflow, or heat-conductive materials), 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 (a thin, generally unpadded layer not designed to improve comfort), 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."@en . . . . "Mattress pad"@en . . . . . . "6909"^^ . . . . . "1109156105"^^ . . . . . . . . . "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. Like a mattress protector/mattress pad/mattress cover (a thin, generally unpadded layer not designed to improve comfort), 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."@en . . . . . "19158374"^^ .