Big & Tall Mesh High-Back Chair offers a variety of comfort features and a 400 lb. capacity for a variety of users. Breathable mesh back includes height-adjustable lumbar support and a built-in ratchet device for back-height adjustment. Tractor seat with polyurethane molded foam and fabric upholstery adjusts in height. Arms with polyurethane pads adjust in height and width. Other features include combination seat/back angle adjustment with infinite lock, tilt tension adjustment, forward tilt, seat slider and 360-degree swivel. Aluminum base with black powder coating has 60mm nylon casters for easy rolling.