BEVCO's Everlast chairs are specifically designed for outstanding comfort and long-lasting use in the toughest work environments. The black polyurethane seat and back are anti-bacterial, impervious to water, oil, and most chemicals; puncture resistant and easy to clean. This independent seat and back tilt model features independent seat and back adjustments for increased comfort during extended sitting durations. 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 from 16" - 21". Ergonomic adjustable arms enable the user to relieve neck and shoulder tension. This chair comes with a sturdy 25" diameter black nylon base. Model comes with dual wheel hard floor casters.