Ergonomic computer desk chair supports your back and hips with a contoured 19.5-in mesh backrest and built-in lumbar area that follow the curve of your spine to reduce pressure points. The 19 x 19 in sponge seat cushion distributes weight to relieve discomfort during long work sessions, while breathable mesh promotes airflow to keep you cool. A gas lift lets you adjust the 18-21 in seat height and rocking tension, and 90° flip-up armrests free space under your desk while 360° casters support up to 330 lbs.