High-Back Molded Seat Chair offers a contoured, cushioned seat upholstered in fabric to match the comfort of the flexible, breathable mesh back with built-in lumbar support. Move the adjustable lumbar support up or down so you can relax your back against the right pressure. You can also adjust the seat height from 17-1/4" to 20-3/4" and the arm height from 24-1/2" to 28". Other functions include tilt/lock that can lock in three positions, 360-degree swivel and tilt tension adjustment. Five-star nylon base features dual-wheeled casters for easy moving. Seat measures 20" wide x 17" deep. Back size is 19-1/4" wide x 22" high. Weight capacity is 275 lb.