【Certified Safety & Stability】Certified by SGS, TUV, and BIFMA for safety and durability. This ergonomic office chair is equipped with an explosion-proof gas lift and a reinforced metal base, it supports up to 332 lbs. Smooth-rolling casters protect your floors while ensuring stability and easy mobility. 【3-Zone Adjustable Lumbar Support】Designed with a dynamic split lumbar support system, the desk chair offers three height levels to fit different body types. The lumbar tension can be adjusted via a knob, reducing up to 52% of lower back pressure and improving posture comfort during long hours of sitting. 【Multi-Angle Recline & Mesh Footrest】Featuring a 4-position lock between 90°–135°, this computer chair adapts to working, relaxing, and resting postures. The retractable mesh footrest provides leg support without ankle pressure, allowing you to switch freely between work and break mode. 【Fully Adjustable Headrest & Armrests】The headrest and armrests are adjustable in height, angle, and depth to support your neck and arms properly. This ensures comfort for users of different heights and body shapes.