The Deluxe Air Grid Back Chair offers a modern style & multiple ergonomic adjustments to keep you more comfortable while working. Breathable Dark Air Grid Back is equipped with built-in lumbar support. To further your comfort, this office task chair features a thick padded seat & polyurethane arms that adjust in height & width. Seat slider allows you to adjust the depth of the chair to meet your needs. Chair also features pneumatic seat-height adjustment from 19" to 23-1/2". The heavy-duty, angled nylon base is equipped with oversized, dual-wheel carpet casters. Seat measures 19-1/2" wide x 20" deep x 4" thick. Back size is 20" wide x 19" high.