Sihoo Ergonomic Office Chair V1 3D Adjustable High-Back Breathable With Footrest And Lumbar Support [Ergonomic design] The Y-shape backrest frame of the ergonomic office chair provides all-round elastic support and protection. The S-shape backrest fits for the spine curve, and the global designed hand feel is as soft as human body shape. The ergonomic office chair provides long term comfort and perfect support for all health-conscious users.[ Customized high backrest] The 4D lumbar support can provide users with customized lumbar care. The 5-gear adjustable backrest can make users of all heights find their comfortable sitting postures, and the inclination of the desk chair can be adjusted to four angles, i.e., 110°, 120°, 130° and 140°. The office chair can be applied to various scenes such as working, entertainment and rest due to flexible adjustment performance.[ Suitable for more people] With the high-elastic sponge seat cushion, the office chair is adjustable in the depth of 5cm, providing people of various sitting postures with sufficient seating space. The mobile armrest has a supporting adjustable distance of 2.5cm, and it can be adjusted up and down, with eight gears. It is the right hand in the living room and study room at home, and the best choice for white-collar workers in offices.[ Delicate quality] The big-size headrest with high-grade oil wax PU is adopted, to provide users with environmentally protective and comfortable sitting experience. The reinforced full-steel hydraulic pressure rod has passed SGS and American BIFMA certifications. The precise electroplating aluminum alloy feet are attractive and durable, providing seats with high-pressure core support. It is the most trusted choice as a present due to the top-ranking workmanship and the original design.[