DO NOT BUY. Insultingly cheap construction for the price. The holes in the arms don't properly align with either the backrest or the bottom, making them almost impossible to securely screw in. The base of the chair is one cheap piston and a completely useless series of plastic tubes (that are meant to snap together and don't) that go around it and end up serving zero functional purpose. The whole chair (and your weight) ends up being supported by the piston itself, making it very creaky and unstable. I am a petite woman and am worried this is going to break under me. The seat is also much smaller than I thought it would be; if you use a lumbar pillow, be aware that it will end up pushing you halfway off the chair. Whoever manufactures this ripped off a better design, and if you buy this chair, they'll be ripping you off too.