Mid-back task chair features adjustable arms and molded foam, contoured seat and back that provide long-lasting comfort. Waterfall seat provides under-thigh support. Arms adjust in width from 18″ to 19-1/2″. Functions include pneumatic seat-height adjustment (18-1/10″ to 21-7/10″ high from the floor), back-height adjustment, 360-degree swivel, tilt tension, tilt lock and asynchronous control. Waterfall seat provides under thigh support. Task chair offers a 250 lb. weight capacity and is available in black frame only. The fabric is 100 percent polyester.