Mesh Back Chair features a breathable mesh back and fabric-upholstered, cushioned seat for comfort. Black plastic frame features a 27-1/2" five-star nylon base equipped with dual-wheel, hooded casters. Functions includes pneumatic seat-height adjustment from 19.69" to 23.23", 360-degree swivel, seat-depth adjustment, tilt tension adjustment and backrest tilt angle with three stage adjustments. The posture mechanism/lock allows the back angle to adjust independently of the seat and can be locked in a number of positions. Adjustable-height arms with polyurethane pads offer a soft surface to rest your arms. Seat size is 19.1" wide x 18.1" to 20.1" deep. Back measures 18.9" wide x 17.3" high. Distance between arms are 18.5". Weight capacity is 250 lb.