Stretch-back work chair features the indoor advantage gold certification for being environmentally friendly and is endorsed by The World Chiropractic Alliance, 100 percent polyester with ilira stretch material allows airflow and breathability, Work chair features a flexing back, Arms adjust in height and width, Functions include pneumatic seat-height adjustment, seat-glide mechanism, 360-degree swivel, passive synchro-tilt motion, synchronized knee tilt, tilt tension and tilt lock, Chair meets or exceeds applicable ANSI/BIFMA standards, SKU: SPRCH33426