The design of this office chair fully considers the principles of ergonomics. The curved design of the backrest perfectly conforms to the natural curve of your spine, providing strong support for your neck, shoulders, and back. This effectively relieves pressure on your back and waist, helping to maintain spinal health. Furthermore, the seat features a widened design, and the high backrest is equipped with modern side wings that offer comprehensive and stable support. The upholstery is made of PU Leather, which is durable, easy to clean, and has a natural luster that adds aesthetic appeal to your workspace. In terms of quality, the five-star metal base is BIFMA certified, the Class 3 gas lift is SGS certified, and the foam frame is FSC certified. These certifications collectively ensure the chair’s stability and durability. Regarding flexibility, the seat height can be adjusted between 20.66 and 24.61 inches. Additionally, the armrests are adjustable; they can be lowered to provide natural support for your elbows during use, or flipped up 90° to save space under the desk when not in use. The 360° swivel function and smooth-rolling casters allow you to move effortlessly to different positions and face different directions, enhancing your work efficiency. All assembly components and a graphic instruction manual are included in a single box. You can assemble your ideal office chair in just 45 minutes.