Provides direct support for sensitive lumbar ?small of the back" area to minimize back strain and fatigue. High-density medical-grade, anti-allergenic foam retains its shape to keep users comfortable for long periods of time. Elastic strap adjusts to fit any chair and holds the backrest firmly and securely in place. Full size, high quality zipper provides easy access to the removable and machine washable 100% Polyester velour cover.