Dura Heavy-Duty Chair with footring offers extra strength. durability and unwavering support. Perfect for unpredictable work environments, antibacterial polyurethane upholstery is nonslip and resistant to water, oil, most chemicals and punctures. Contours and waterfall seat improve lower-body circulation and encourage proper spine alignment. Pneumatic, non-tilt adjustment allows you to alter both seat height and back depth. Height settings from 21" to 31" ensure people of most heights can work comfortably and ergonomically. Along the office chair's base cylinder, a threaded knob adjusts the 20" chrome footring's height from 6.5" to 16.5". Supporting up to 350 lb., mushroom-glide feet and heavy-duty nylon base remain stable at any height setting. Seat size is 19.25" wide x 17.25" deep. Back measures 15.5" wide x 14.5" high.