Low-back mesh chair features a high-strength elastic nylon mesh back, fabric-upholstered seat and height-adjustable armrests. Seat and back angle can adjust independently. Other functions include ratchet back, pneumatic seat-height adjustment and 360-degree swivel. The 25-1/5" diameter, five-star base is made of reinforced nylon and is equipped with 50mm hooded, dual-wheel casters for easy mobility. Weight capacity is 250 lb. Seat measures 19-3/10" wide x 18-9/10" deep. Back size is 19" wide x 18-1/2" high. Headrest is sold separately.