These Herman Miller Aeron Mesh Ergonomic Office Chairs are considered the best on the market. maximum comfort just read the reviews. I have more than One 
Good Condition. all Mesh is good. only marks would be very minor.
Adjustable Height. Back Seat Tilt. Adjustable New Lumber Pads and New Padding on front of seats. Although the arms are Fixed. they can be adjusted with screws if needed .
Great Chairs Pick up Taunton Somerset great price. Viewing very welcome