About this item Ergonomic backrest design: Curved backrest can perfectly line up with human body line and support your spines natural curve. The lumbar support system resembles a pair of hands, pushing up and holding your low back. Star base & 360 degrees wheels: Twisting and turning about is integral within the office. So we adopt a stable star base and equip it with 5pcs 360-degree swivel wheels, ensuring fluent and quick movement and keeping up your quick pace of work. Adjustable seat height: The seat height of this computer mesh chair can be simply adjusted from 35cm/13.8 to 45cm/17.7 by a little push-up/press down at the lever under the seat according to your needs. Breathable mid-back design: Featuring densely knitted mesh backrest, this mesh office chair allows better airflow, accelerating heat and moisture dissipation. Mid-back design supports your spine's natural curve and protects your lower and middle back as it prompts you to sit straight. Larger seat for optimal comfort: I