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. Unique shape supports and aligns. Memory foam softens with body heat, molds to back. Set the most comfortable position with SmartFit system. Memory Foam content, 50% recycled. Back Support Type: Chair; Material(s): High-Density Memory Cell Pressure-Sensitive Foam; Width: 16 5/8 in; Depth: 2 7/8 in.