Ergonomic Office Chair - SUNNOW office chair is designed according to the golden ratio of human sitting posture, providing effective support for the head, neck, back, waist and etc. SUNNOW ergonomic chair perfectly fits the curve of the spine, so you don't get tired of sitting for a long time. Dynamic Lumbar Support - SUNNOW ergonomic office chair has innovatively added dynamic adaptive adjustable lumbar support which can effectively relieve lower back pain. The lumbar support of SUNNOW office chair can be adjusted in 3 heights to fit your lumbar spine better and avoid lumbar overhang. Flip-up Armrest - The armrest of SUNNOW desk chair is made of high-density foam and elastic mesh, providing comfy cushioning for your arms. SUNNOW office chair armrests flip up 90° to easily slide under the desk. Also, SUNNOW ergonomic office chair can be transformed into an armless chair in seconds. Wide Thickened Cushion - The cushion of SUNNOW mesh office chair is designed with waterfall cur