Heavy Duty 300lbs Office Chair with Mid Back, Nylon Base and Adjustable Armrest Heavy Duty task chair, weight capacity 300lbs Seat Height: 18.1"-22", Back Area: 20.1"(w)*22.4"(h), Seat Area: 22"(w)* 18.1"(depth) Exceptionally good breathability: ergonomic comfortable mesh office chair, designed to provide exceptional back support and to prevent body heat and moisture build up Quiet and smooth gliding with nylon base and caster, no harm to hardwood floor