Vault Task Chair with no arms goes beyond the expected with features that let you personalize your comfort. Uncommon for a mesh back design, ratchet back-height adjustment lets you raise or lower the backrest for the greatest comfort. High-quality, woven tension mesh in black conforms to your back, following every move with support, including the lumbar region. Advanced, K2 knee-tilt control includes side-tension adjustment and three-position lock. Seat slider adjusts the seat depth from 16" to 18-1/2" so you are just where you need to be. Other functions include pneumatic seat-height adjustment from 18-1/2" to 21-1/2" and 360-degree swivel. High-resilient, molded foam seat features a waterfall seat front to promote circulation and good health. 20" wide seat is upholstered in Onyx fabric. Durable, black nylon base with five casters offers long, trouble-free service. Weight capacity is 300 lb.