This chair broke in the second day lumbar support is terrible and the plastic broke on the second day of use. One of the arms would not tighten up. The retaining bolts are threaded into plastic when it should be metal. For the price this chair is terrible. I sent it back.
I did a lot of research on computer chairs and kept coming back to this one. I am glad I did this thing feels great. I am ordering a second one for my home office.