Low-profile design offers full back support. Ergonomic shape helps minimize back strain and fatigue. High-density medical grade, anti-allergenic foam retains its shape. Full size zipper on machine-washable 100% polyester cover. Elastic strap keeps backrest in place and adjusts to fit any chair. Back Support Type: Chair; Material(s): High-Density Foam; Color(s): Black; Adjustability Features: Elastic Strap.