ACCO BRANDS, INC.-CUSHION,SEATREST,VISCO,BK. Memory Foam Seat Rest, 13-1/2"w x 14-1/2"d x 2"h, Black. 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. Dissipates pressure while conforming to body contours. Leather-like bottom cover reduces movement on chair. Back Support Type: Chair; Material(s): High-Density, Temperature-Sensitive Memory Cell Foam; Width: 13 1/2 in; Depth: 2 in.