Mid-back work chair features the indoor advantage gold certification for being environmentally friendly and is endorsed by The World Chiropractic Alliance. 100 percent polyester material with Nano-Tex stain-resistant fabric 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.