Mid-back stool offers ratchet back & 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 & chrome footring to heighten your comfort. Included arms adjust in height (32" x 42-1/2") & 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 & back-height adjustment. 25-1/2" diameter, five-star steel base has a polypropylene cap & 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.