I have one on my forearm, a thorshammer. I made it when I had just finished 2 months working in a trawl boat out of the coasts of Iceland so I had a very musculous forearm (thats how you become when you work very hard labor 12-20 hours a day for 2 weeks, 2 days off and then back for 2 weeks), but I have probably been around 280-300 lbs back then. Then my forearms got a lot fatter, but after losing 86 lbs (out of 403 lbs) I really dont see any change in the tattoo. The form is very fixed so there arent many fuzzy lines or things like that, so I am confindent it will stay the same.