【Comfortable ergonomics office chair】The office chair is breathable high-quality high back, cushion composed of high-density sponge, maximize the comfort of a long time sitting. (Suitable for the crowd: 150-180CM, the maximum load-bearing capacity: 300LBS, tilt angle: 103-124°)【Adjustable Angle Design】 SIHOO ergonomic office chair has two adjustable angle designs: foldable armrests and lumbar pillow design. If you don't need to use the chair, you can flip up 90 degrees to fold the armrests for storage to save space. The lumbar pillow can be adjusted up and down by 3cm to provide strong support for your lower back.【3D Headrest Design】The headrest adopts 3D adjustable design, which can be adjusted up and down by 10CM and double joints can be flipped by 22 degrees, adjusting to the most suitable for your needs, providing the most comfortable angle support for your neck and maximizing comfort.【Enlarged seat cushion, Raised Back Height】The upgraded version of the M76A cushion is wider and larger, and the backrest is raised to 57CM, so that our backs and hips can get the best support, relieve pressure, and promote the formation of a good posture.【Professional after-sales Service, Quality Assurance】SIHOO has a professional after-sales service, providing three-year warranty service, within thirty days of any problem, free return. The office chair is TÜV certified and meets the US SGS BIFMA durability and safety standards, ensuring the safety of the product.