Adjustable Lumbar Support: This ergonomic office chair is equipped with a lumbar adjustment knob that allows the lumbar cushion to move forward and backward, and it can be moved up and down directly to accommodate users of different heights 3D Armrests: The armrests of the ergonomic chair can be fully lifted, moved forward, backward, and rotated 360 degrees, allowing you to customize the desired angle at will. Rocking Function：The ergonomic chair allows for a rocking motion between 90 to 120 degrees, offering a relaxed and comfortable experience. Stable and Durable: The office chair is equipped with 360 degree rotating casters, featuring smooth and quiet rolling wheels, a sturdy base, and SGS4 Class 4 ensuring greater safety. Breathable Mesh Design: The chair features a mesh backrest and seat that facilitate excellent air circulation, providing a comfortable sitting experience. The mesh material ensures you stay cool and comfortable even during extended periods of use.