Executive mid-back chair features a breathable nylon mesh back and seat along with poly fixed arms for comfortable seating at your desk. Functions include pneumatic seat-height adjustment from 18" to 21-3/4" , 360-degree swivel and tilt tension. 26-4/5" diameter, five-star nylon base is equipped with 55mm hooded, dual-wheel casters for easy mobility. Weight capacity is 275 lb. Seat measures 19-1/2" wide x 17-1/2" deep. Back size is 18-3/4" wide x 18" high.