Integra Series Chair effectively meets the needs of various work environments. Pneumatic, articulating seat and back tilt adjustment allow you to work from the most optimal position. Ergonomic seat adjusts in height from 24" to 34". 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 footring's height from 7.5" to 17.5". Sturdy, five-legged nylon base moves on mushroom glides and supports up to 300 lb. to ensure stability at any height. Fabric upholstery on seat and back meet CAL 117 and NFPA 260A/UFAC Class 1 standards. Seat size is 20" wide x 18" high. Back measures 17.5" wide x 16" high.