Conductive Bench Height Cleanroom Chair, Aluminum Base, Adjustable 21-31". Options Include Armrests, Footring, 2 and 3 Lever Seat Control and more. - 300 pound capacity 18" wide, 17" deep seat 2.5" Thick high resilient foam. Standard back - 13" high, 15.5" wide. Rubber edge banding on seat and back for good protection.