Product Features: Ergonomic Design: This ergonomic office chair features an "S" backrest design and adjustable lumbar support, perfectly fitting the natural curve of your lower back to relieve spinal discomfort. The high backrest can be adjusted up and down by 4", making it suitable for users of different heights.Head & Lumbar Support: The SOOHOW desk chair£ªs lumbar support system contours to your lower back and spine with unparalleled precision, offering robust support to alleviate pressure and reduce the risk of back pain. The headrest is adjustable by 2 inches vertically and rotates 45¡«, cradling your head to safeguard your neck health during long work hours.Ergonomic Adjustability for All: Equipped with 3D adjustable armrests (movable up/down, forward/backward, and rotatable 35¡«), this ergonomic chair accommodates various body types. It also features a tilting function (90¡«-120¡«-135¡«) and height adjustability from 15" to 18", ensuring personalized comfort for all postures.Comfortable & Breathable: The high-quality reinforced mesh backrest keeps your back cool and comfortable, allowing you to stay focused and relaxed. Additionally, the chair has soft PU padded armrests and a high-density sponge cushion for enhanced comfort.Safe & Easy Assembly: Made with durable nylon and metal, this ergonomic office chair is stable and supports up to 350 lbs. Installation is quick and easy, taking only about 15 minutes with the included instructions¨•no additional tools required.