High-density memory cell foam was originally developed by NASA to relieve G-force strain during lift off. Temperature- and pressure-sensitive, it molds to the body's contour, offering optimal comfort. Maximum support relieves back discomfort. Removable, washable cotton/polyester fabric cover. Back Support Type: Chair; Material(s): High-Density Memory Cell Pressure-Sensitive Foam; Width: 15 1/2 in; Depth: 2 1/2 in.