I ordered medium and they fit my 6'1" 120 lb 14 year old son. They are just long enough and fit well along the legs. They also fit my 5'7" 120 lb daughter and she loves them too. The zippers look better on the gray than the darker navy and they would look better without the zipper altogether. The material is lightweight and soft, very nice. I am really happy with these. I tried ordering the Mens Galaxy Joggers (also sold on this site) and they are super short on my son and a really heavy, scratchy fleece, so those are going back.
fit well, if you are a size 38 waste, the XXL will fit fine. Only gripe i have is that the zippers are chrome/shiny metal. Was hoping that they were just white, but whatever. my shirts cover them anyway. very comfy!