Mid-back chair features a body weight control mechanism that moves with you. This chair control allows your body weight to recline the chair and return the chair to its task position for easier control. Self-tilt tension adjustment offers five locking positions. Other functions include 360-degree swivel and pneumatic seat-height adjustment from 18-1/4" to 22-1/4". The height-adjustable arms are covered with polyurethane pads for your comfort. Recline easily with the mesh back and seat upholstered with fabric. 27-1/6" diameter spider base is made of nylon and equipped with five 60mm dual-wheel casters for easy chair movement. Weight capacity is 250 lb. Seat measures 19-1/8" wide x 17-1/8" deep. Back dimensions are 19-9/31" wide x 21-6/23" high.