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.