Task chair offers a molded seat & sculpted back with integral lumbar support. Waterfall seat front provides comfortable under-thigh support & minimizes pressure on the legs. Functions include pneumatic seat-height adjustment from 17" to 22", adjustable back height, tilt, tilt lock, multi-task control, & 360-degree swivel. Five-star nylon base includes 2" hooded dual-wheel casters. Seat size is 20" wide x 18" deep. Usable seat depth is 16-3/4". Back measures 16-1/4" wide x 21" high. Arms for chair are sold separately. Chair is certified by SCS to be in compliance with specific, indoor, air-quality emission requirements. Chair meets or exceeds applicable ANSI / BIFMA standards.