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 18-1/4" x 21-7/8" & are padded with polyurethane. Back is covered in mesh for flexible & breathable reclining while the thickly cushioned seat is upholstered in fabric. 27-1/6" diameter spider nylon base is equipped with 60mm casters for easy chair movement. Weight capacity is 250 lb. Seat measures 20" wide x 17-3/8" deep. Back dimensions are 18-7/8" wide x 22-5/6" high.