Mid-back chair offers bonded a mesh fabric seat, breathable suspension mesh on the back for conforming comfort as well as built-in lumbar support that easily adjusts for ergonomic positioning. Big & Tall design allows a 400 lb. capacity. Arms with soft polyurethane pads adjust in height. Other functions include pneumatic seat-height adjustment, 360-degree swivel and tilt tension. Five-star chrome base is equipped with five heavy-duty casters for easy chair movement.