Perfectly fit and support your shoulders, provide adequate lumbosacral support, and are suitable for people who need long-time working and gaming. 2D headrest, 3D Armrest, 3 lockable positions, and a 135° recline range. Easily adjust to your most comfortable position for work or rest. high-quality special mesh fabric, mechanically thick steel base, strong to hold up to 300 pounds. Class 4 gas lift is safe and reliable. Passed 200,000 cycles of backrest durability test, creating the most comfortable gaming chair.