I have tried to get in touch with customer service for weeks (on hold for 35+ minutes) and have been unsuccessful, so I will leave a review. I bought this chair and really liked it, however, after 2 weeks from working at home, it now slowly slides down from the height you have it on to the lowest position. I am 5'4" and 160lbs, and there is no indication that it can't support my weight in the product description. There is no where to tighten it to help mitigate the problem either. At this point, it has surpassed the 30 day option to get a replacement part or replacement altogether, but I couldn't get through to anyone, unfortunately. I wish this would have worked, but I am now going to purchase a different chair from a different company.