【Elastic and Adaptive Three-zone Lumbar Support】 This office chair's bilateral wing support wraps the left and right lumbar muscles to provide effective support and help prevent spinal stenosis. Support can be dynamically adjusted according to waist position to suit different body types and positions. 【Independent Liftable Backrest】 The S-shaped bionic backrest of this ergonomic office chair fits the curve of your spine, reduces the burden on your lower back, and allows you to relax even when sitting for a long period of time. The frame (aluminum) adopts a double U-shaped design, which is stable and durable, and not easy to deform. 【Versatile Ergonomic Design】 The depth of the seat can be adjusted within 1.6'' to match different body types and different sitting positions. In addition, the large C-shaped headrest can lift up 3.9'' and rotate 20 degrees, continuously supporting the cervical spine and eliminating sitting fatigue. More importantly, the 3D armrest can not only be vertically adjusted by 3.15'', but also by 2.36'' back and forth, and rotated 120° inside and out. 【Comfortable Reclining Backrest】 The reclining seat of the desk chair can be adjusted 3 levels to meet your needs in the office, gaming, lunch break, etc. When you're tired, you can lie down and forget your fatigue and worries. Equipped with a footrest, you have a place to rest your legs, relax your muscles, provide soft support for your feet after a long period of sitting, and relieve your fatigue. 【Three-year warranty, guaranteed service】 Hbada provides a three-year warranty that is processed in the most hassle-free way possible(90-day Returns and Exchanges for free 3-year Maintenance (Free part repair & replacement & refund with no excuse). Customer-first is the original aspiration of Hbada. No matter what problems you encounter during use, you can contact us. We will provide you with professional services for the product. Product size: width 27.5'' x depth 27.5'' x height 45-55'' (seat height: 18-22''); weight 40lbs; static load capacity approx. 300lbs.