Vault Mid-back Stool 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 from 23" to 25-1/2" for the greatest comfort. High-quality, woven tension mesh in black conforms to your back, following every move with support, including the lumbar region. Seat slider adjusts the seat depth from 16" to 18-1/2" so you are just where you need to be. T-shaped arms adjust in height by 3-1/2" with the push of a button. Other functions include upright tilt lock, 3:1 back-to-seat tilt ratio, center knob tension adjustment, pneumatic seat-height adjustment from 23" to 31" for use with worksurfaces up to 36" high and 360-degree swivel. High-resilient, molded foam seat features a waterfall seat front to promote circulation. 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.