single density molded foam w/anti-thrust features a large radius bottom that fits a sling or flat seated wheelchair. Waterfall front design allows for greater comfort when seated for long periods at a time. Kwik Strap securely attaches cushion to wheelchair during transfers to prevent sliding or slipping.    #081537489-16x16 Each   #081537497-18x16 Each   #081537505-20x16 Each UNSPSC#42141705