When attaching the arms you MUST leave the screws very loose or it will be impossible to attach the back. The instructions didn't make clear at least to me how important that it.
With a 400 lb rating a very high seat and firm cushions it fits me well but maybe not for skinny tall as cushions are firm or heavy short people as it only goes higher from what fits my 6'2" 310 lb body.
My son is over 300lbs and 5’10”. I am 190lbs and 5’8”. The chair was purchased for my son due to his size. He had broken many types of chairs so we decided to try an office chair. I was excited to learn they made office chairs designed for the bigger person. This chair was quick to assemble. It’s plenty enough to support his bigger size while also being very comfortable for my body size as well. I very much would recommend this chair.
Lived the chair lower rating because no dimensions on box . It was too high for my legs and did not fit under my desk. Note: I am short . Most people would be ok
It was challenging to put the back on. I did it myself you have to push in the arm rests and lightly screw in the top screw first then flip the back into the upright position to screw in the bottom screw.