Integra ISO 7 Cleanroom Chair effectively meets the needs of various work environments, especially cleanrooms and healthcare settings. Antibacterial, anti-fungal vinyl upholstery meets ASTM G21 and AATCC TM147 standards for cleanliness and safety as well as CAL 117, FMVSS 302 and NFPA 260 standards. Pneumatic, non-tilt adjustment design allows you to alter both seat height and back depth. Ergonomic seat can be adjusts in height from 21.5" to 31.5". Waterfall seat improves lower-body circulation and overall health. Fully contoured back provides added lumbar support and encourages proper spine alignment. Along the office chair's base cylinder, a threaded knob adjusts the 20" chrome foot ring's height from 7.5" to 17.5" Sturdy, five-legged aluminum base moves on mushroom glides and supports up to 300 lb. to ensure stability at any height. Seat size is 20" wide x 18" high. Back measures 17.5" wide x 16" high.