First of all I sat in this chair inside Staples and it was perfect; they delivered it and it’s extremely difficult to put together, the directions are useless; the lever that raises and lowers the chair is so far behind you that you have to turn around to use it while sitting in the chair instead of it being upfront, the lumbar support doesn’t move at all, it’s just a stationary lumbar lump. It is not comfortable and I am giving it away, get that, giving it away!
The chair is okay, but I specifically bought this chair because it stated the seat's lowest level was 16". It is more like 18 or 18.5. Also, the tension knob really does not make any difference. It's hard to twist, and I did not notice any difference in the tension. I would not buy this chair again.