Integra ISO 7 Cleanroom Chair effectively meets the needs of various work environments, especially cleanrooms and healthcare settings. Antibacterial, anti-fungal vinyl meets ASTM G21 and AATCC TM147 standards for cleanliness and safety as well as CAL 117, FMVSS 302 and NFPA 260 standards. Pneumatic, articulating seat and back tilt adjustment allow you to work from an optimal position. Ergonomic seat 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.