ACCO BRANDS, INC.-BACKREST,VISCO,BK. Memory Foam Backrest, 13-1/4w x 1-3/4d x 14-1/4h, 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. Provides maximum back support. Two adjustable straps hold cushion in place. Back Support Type: Chair; Material(s): High-Density Memory Cell Pressure-Sensitive Foam; Width: 13 1/4 in; Depth: 1 3/4 in.