Originally designed for architects, the drafting chair can be beneficial to anyone whose workspace is higher than conventional desks. The multiple adjustment areas and cushioned design will give you a comfortable seat to get through the workday. Mid back design with back depth adjustment knob and padded swivel seat with CAL 117 fire retardant foam Two Seat Height Ranges with Gas Cylinder Height Extenders, Cylinder Heights: 22.5-27" or 26-30.5"H Contemporary drafting stool PRODUCT MEASUREMENTS: Overall Size: 20"W x 20"D x 38.25-42.75"H; Seat Size: 18"W x 16.5"D x 26-30.5"H; Back Size: 16"W x 16.5"H; Arm Size: 8.5-11.5"H from seat