Mesh Back Stool features a breathable mesh back, footring and fabric-upholstered, cushion seat for comfort. Black plastic frame features a 27-1/2" five-star nylon base equipped with casters. Functions include pneumatic seat-height adjustment from 25.4" x 32.7" , 360-degree swivel, backward strength adjustment and tilt tension. The posture mechanism/lock allows the back angle to adjust independently of the seat and can be locked in an infinite number of positions. Adjustable-height arms with polyurethane pad 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 is 18.5". Weight capacity is 250 lb..