Designed to bring comfort, stress relief and durability to the workplace, Ergolux backless stool is perfect for general and medical offices, laboratories and higher education applications. Stress-free pneumatic adjustment allows you to easily alter seat height. Height settings from 18" to 22.5" 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. High-density, visco-elastic memory foam measures 3.5" thick and provides long-lasting, ergonomic support. Sturdy, five-legged nylon base moves seamlessly on dual-wheeled hard floor casters and supports up to 300 lb. at a time. Seat size is 14.5" in diameter.