Mid-back stool offers ratchet back and a comfortable, breathable mesh back. Mesh is made of high-strength elastic nylon. Ergonomically designed mid-back is perfect for the natural curvature of a person’s back. Design also features a cushioned fabric seat and chrome footring to heighten your comfort. Included arms adjust in height (32″ x 42-1/2″) and in width (24″ to 26″) to suit your needs. Other functions include pneumatic seat-height adjustment from 25″ to 35-2/5″ , 360-degree swivel and back-height adjustment. 25-1/2″ diameter, five-star steel base has a polypropylene cap and casters for easy mobility. Seat size is 20″ wide x 18-7/10″ deep. Back measures 20″ wide (at the widest portion) x 19-7/10″ high. Weight capacity is 250 lb.