Mid-back chair features a sophisticated cable control mechanism to control the many chair comfort functions. Synchro tilt offers five locking positions. Seat-glide mechanism allows the seat cushion to travel forward & back & then lock into position. Other functions include pneumatic seat-height adjustment, seat-depth adjustment, 360-degree swivel, tilt tension & tilt lock. Arms adjust in height from 18-1/8" to 21-5/8" are padded with polyurethane. Both back & seat are covered in mesh for flexible & breathable seating. The seat & back frames are made of plastic. 27-1/6" diameter spider nylon base is equipped with 60mm dual-wheeled casters for easy chair movement. Weight capacity is 250 lb. Seat measures 20-1/2" wide x 18-1/8" deep. Back dimensions are 19-3/4" wide x 21-6/23" high.