About this item Ergonomic Back: This swivel computer chair is thoughtfully designed with an S-shaped back to fit in the curvature of the individuals back and lumbar. It gives full support to your lumbar and upper back, making your long office hours and intensive study sessions easier in a better sitting position. The lumbar support can be adjusted within a 5cm range for customized comfort. Optimized Comfort: This computer chair is soft padded with high-density foam and has a large seating area of 19.7 W x 19.7 D. The thick cushion provides a soft and fatigue-free sitting experience, while the breathable mesh back allows air, body heat, and moisture to pass through, helping you stay at a comfortable temperature. Sturdy & Durable: This office chair is combined of a plastic & mesh back, foam-padded seat, steel gas spring and nylon base & wheels. Premium plastic is durable and oxidation-resistant, so no need to worry about a humid environment. Standard market size with great bearing capaci