The Simply Ergonomic Task Chair is built for all-day desk work. A mesh backrest lets air move while you sit, and the adjustable lumbar support and seat depth adjustment fit the chair to your body. The 3D armrests adjust for height, slide forward and back, and twist. Seat height runs from 18.5" to 22", and the synchro-tilt mechanism locks the backrest in position with adjustable recline tension. The thick molded foam seat sits on a nylon base with dual-wheel casters and a Class III pneumatic cylinder. For counters, standing desks and drafting tables, the Simply Ergonomic Task Chair with Stool Kit raises the same chair 10 inches and adds a chrome footring.