Integra ESD Chair effectively meets the needs of various work environments. Pneumatic, non-tilt adjustment allows you to alter both seat height and back depth. Seat height adjusts from 15.5" to 21" to ensure people of most heights can work comfortably. Back contours and waterfall seat improve lower-body circulation and encourage proper spine alignment. Threaded adjustment knob moves 20" chrome footring in height along the base cylinder. Sturdy, five-legged aluminum base moves on ESD mushroom glides and comes complete with conductive components and a brass drag chain. ESD components meet ANSI/ESD STM12.1 standards. Fabric upholstery meets CAL 117 and NFPA 260A/UFAC Class 1 standards. Office chair supports up to 300 lb. and provides stability at any height. Seat size is 20" wide x 18" high. Back measures 17.5" wide x 16" high.