I normally wear size 11 US shoes but I saw that a size 11.5 was on sale and I couldn't afford to miss out on that offer so I bought them straight away and I'm glad I did because these shoes are very comfortable. If I had bought 11 I would have been in trouble. There is no room in these shoes, so they are a bit uncomfortable. However, they are so bright and beautiful that I will use them until they expand lol.