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 275 lb. capacity and is available in black frame only. The fabric is 100 percent polyester.