Adjustable task chair offers a molded seat and back for all-day comfort. Durable shellback and seat base deliver clean smooth lines. Height-adjustable back provides support where you need it. Functions include pneumatic seat-height adjustment from 17-3/10" to 22-2/5" , back-height adjustment, seat-depth adjustment and 360-degree swivel. Arms adjust in height and width. Abrasion rating is 30,000 cycles. Weight capacity is 250 lb. Seat size is 18-9/10" x 18-1/2". Back measures 16-9/10" x 15-2/5".