Executive Big and Tall Chair features a double air-grid back with adjustable lumbar support and thickly padded contoured mesh seat. Built-in arms adjust in height and width and feature soft polyurethane pads. Functions include one-touch pneumatic seat-height adjustment from 19-3/4″ to 22-1/4″ , mid-pivot knee tilt control, adjustable tilt tension and integral lumbar. Weight capacity is 400 lb. Seat size is 22″ wide x 21″ deep x 4-1/4″ thick. Back size is 21-1/4″ wide x 22″ high. Heavy-duty five-star base with gunmetal finish offers five dual-wheel casters for easy chair movement.