Task chair offers a sculpted, molded back with integral lumbar support. Waterfall seat front provides comfortable under-thigh support. Functions include pneumatic seat-height adjustment from 14-7/8" to 19-3/4" , adjustable back height, seat-depth adjustment and 360-degree swivel. Seat and back are upholstered in 100 percent polyester fabric with Nano-Tex soil-repellant and stain-repellant technology. The Centurion pattern is Iron Ore. Five-star base includes 2" hooded dual-wheel casters. Seat size is 20" wide x 18" deep. Usable seat depth is 16-3/8" to 18-1/8". Back measures 16-1/2" wide x 17-3/4" high. Arms for the chair are sold separately. Chair is certified by SCS to be in compliance with specific, indoor, air-quality emission requirements. It also meets or exceeds applicable ANSI/BIFMA standards.Task chair offers a sculpted, molded back with integral lumbar support. Waterfall seat front provides comfortable under-thigh support. Functions include pneumatic seat-height adjustment from 14-7/8" to 19-3/4" , adjustable back height, seat-depth adjustment and 360-degree swivel. Seat and back are upholstered in 100 percent polyester fabric with Nano-Tex soil-repellant and stain-repellant technology. The Centurion pattern is Iron Ore. Five-star base includes 2" hooded dual-wheel casters. Seat size is 20" wide x 18" deep. Usable seat depth is 16-3/8" to 18-1/8". Back measures 16-1/2" wide x 17-3/4" high. Arms for the chair are sold separately. Chair is certified by SCS to be in compliance with specific, indoor, air-quality emission requirements. It also meets or exceeds applicable ANSI/BIFMA standards.