Everlast Electrostatic Dissipative (ESD) Chair lets you work comfortably in even the toughest work environments. Pneumatic, non-tilt adjustment design allows you to alter both seat height and back depth. Height settings from 18.5" to 17" ensure people of most heights can work comfortably. Perfect for unpredictable work environments, antibacterial polyurethane upholstery is nonslip and resistant to water, oil, most chemicals and punctures. Crafted with overall health in mind, featured contours and waterfall-seat design improve lower-body circulation and encourage proper spine alignment. Conveniently placed handle helps when relocating work spaces. Along the office chair's base cylinder, a threaded knob adjusts the 18" ESD footring's height from 7.5" to 17.5". Sturdy, five-legged aluminum base moves on ESD mushroom glides and comes complete with conductive components and brass drag chain. ESD chair components meet ANSI/ESD STM12.1 standards. Office chair supports up to 300 lb.