Apprentice II Extended Height Chair offers ergonomically supportive seating with two-ply foam back and two-ply foam seat upholstered with vinyl. Adjustable height back features built-in lumbar support. Functions also include pneumatic seat-height adjustment and 360-degree swivel. Seat features a waterfall edge for better circulation. The 26" molded nylon five-star base has 2" dual-wheel carpet casters. Chair holds up to 250 lb. Adjustable T-pad arms are sold separately.