The Obus Ultra Forme Seat"s unique design evenly distributes body weight & reduces pressure points for extended sitting comfort. The Obus Ultra Forme Seat is adaptable to any seating environment, simply remove front zippered portion of seat for use on narrow chairs & benches. Two hoop & loo fastening tabs attach the seat to the Obus Ultra Forme backrest to create the Obus Ultra Forme system. Limited 1 year warranty.