Adjustable Lumbar Support: This erqonomic 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. Comfortable Rocking Function: This mesh office chair provides a comfortable rocking function with a smooth 90° to 120° tilt range that gives relaxation and movement throughout your workday. Stable and Durable: The office chair is equipped with 360 degree rotating casters, featuring smooth and quiet rolling wheels, a sturdy base 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.