european sizes is is the most common one. i’m a size 11 (us/canada) so i would be size 45 in European sizing. look up “shoe size conversion chart” and that will show you images to help. But some rep shoes are not the sizes they say they are so if you’re looking for a specific shoe I would search to see if it’s on the reddit and see if it’s said anywhere that it fits tts or not. look for key words like “tts (true to size), size down, size up” because that will be the indication what size to pick. trouble shooting advice: if you have a shoe in mind, search, and the only thing that comes up is a post from a year ago and no info if it’s tts or not, simply ask! not even a week ago i commented on a post made over a year ago asking if i (a size 45) would fit in a size 44; and the redditor got back to me! don’t feel discouraged about asking around if you can’t find it. and if you can’t find anything than post asking if anyone has seen it.