ComforTask Pneumatic Stool offers a fully padded, 20" wide x 18" deep seat for extra comfort & a 16-1/4" wide x 17-3/4" high back contoured for lumbar support. Waterfall front seat edge provides under-thigh support. Functions include pneumatic seat-height adjustment from 21-3/4" to 31-7/8" high, manual back-height adjustment & 360-degree swivel. Footring adjusts from 7-1/8" to 12-3/4" high. Stool is certified by SCS to be in compliance with specific, indoor, air-quality emission requirements & meets or exceeds applicable ANSI / BIFMA standards.