Mesh Back Chair with lumbar support features a high-strength, black nylon mesh on the wide back and black fabric seat with molded foam seat. Padded armrests adjust in height from 6-7/10" to 9-2/5" and width from 19" to 20-1/5". Multi-task control adjusts seat and back angles with a single lever and offers infinite locking within a fixed range up to 16". Seat height range is 3-3/4" from 20" to 23-4/5". Chair moves easily on the five nylon casters (1-24/25") attached to the 27" diameter nylon arched base. Seat dimensions are 20-7/15" wide x 20-7/15" deep. Back size is 19-15/22" wide x 30-9/29" high. Weight capacity is 250 lb.