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.