Ergonomic mesh computer desk chair supports your back with a contoured 19.5-in backrest and built-in lumbar area that follow the curve of your spine to reduce pressure on the lower back and hips. Breathable mesh and a thick sponge seat cushion help maintain airflow and comfort during long sitting sessions. A height-adjustable 18-21-in gas lift with rocking tension control lets you fine-tune support. Flip-up armrests allow the 25 x 25 x 36 in chair to slide under your desk and the 330-lb capacity suits a wide range of users.