Kind of a trick question. The reviews I read before buying read that these run small. I wear a 13 and ordered a size up to 14. The boots say they are European 47. That's my road bike shoe size. These are about right for that, which is normally a 12 1/2 to 13 in U.S. size. These are comfortable and easy to get on an off. I think they are quite a bargain at the price.