Cheerwing Purple Ergonomic Mid-back Mesh Task Chair Office Home Computer Desk Chair Study Size: 20.08 x 20.08 x 33.27-37.99 inch Pneumatic seat - height adjustment for easy positioning Heavy Duty Nylon Base with Dual Wheel Carpet Casters Ergonomically designed for comfort for those who work at desks for long periods. Maximum holding weight: 265 lbs.