[Dual Backrest Lumbar Support] This mesh office chair with a dual backrest structure is designed to provide optimal support for the back and lumbar regions. It features five adjustable height settings, allowing it to accommodate individuals of various heights and seating positions. The elastic adaptive lumbar support is particularly effective in preventing lumbar suspension, muscle strain, and potential lumbar spine injuries, making it an excellent choice for those who spend long hours sitting. [Multi-Adjustable Design] This high back office chair offers a 3.2″ adjustable seat height, a 45° adjustable headrest for enhanced support, 2D armrests that move up and down, and a 90°-130° rocking recline for both work and relaxation. It's suitable for individuals ranging from 4′11″ to 6′3″ in height. [Breathable Mesh Material] Crafted from polyester mesh material, this ergonomic mesh chair offers superior insulation and moisture resistance. Its elastic, skin-friendly surface prevents sweating and sticking during extended sitting. The high-quality mesh provides lasting support without deformation, making it ideal for long office hours. [Sturdy & Stable] Equipped with a 27.5″ steel base, this mesh computer chair can support up to 300 lbs, offering strong pressure resistance and enhanced safety. [Hassle-Free Assembly & Lifetime Warranty] This home office desk chair includes detailed assembly instructions and labeled hardware for easy setup. If you have any questions about assembly or product selection, our professional U.S.-based support team is available to assist you, with responses provided within 12 hours. NOBLEWELL Ergonomic Mesh Office Chair with Flexible Adjustment Lumbar Support, High Back Desk Computer Chair with 2D Wide Headrest, Armrests, 130° Rocking Tilt, Home Office Chair for Long Hours, Grey