The BEVCO EVERLAST series is specifically designed for outstanding comfort, safety and long-lasting use in the toughest technical environments. These durable chairs offer total body support with advanced ergonomic features that improve productivity and reduce fatigue. - The black polyurethane seat and back are impervious to water, oil, and most chemicals and are puncture resistant and easy to clean. Non-tilt models feature a manual backrest adjustment. Tilt models feature the ability to change the angle of the seat and backrest simultaneously for increased comfort during extended sitting. The contoured back is fully adjustable encouraging proper spinal alignment while the convenient handle makes moving the chair effortless. The waterfall seat aids in lower body circulation, improving overall wellness. The pneumatic height adjustment allows you to easily change your seat height. This chair comes with a sturdy black nylon base.