Cheerwing Ergonomic Mesh Mid-back Office Computer Chair Task Chair with Arms (Purple) Mid-back Task Chair, ask chair, 15.75" width by 15.75" depth by 12.99" x 17.71" height Mesh upholstery, Breathable mesh back Black Nylon Pneumatic seat-height adjustment for easy positioning Ergonomically designed for comfort for those who work at desks for long periods