Mesh office chair combines an S-shaped backrest and wide lumbar support to follow your spine and support your lower back during long desk work. The breathable mesh back and elastic fabric promote airflow, while a thick sponge seat cushion adds comfort. An 18-22 in adjustable seat height and 360° swivel help you align with different desks and reach more tasks. A 25-in wide base with smooth casters and steel frame supports up to 330 lbs, and flip-up armrests let you slide it under a desk to save space.