I bought my first pair from a big store. I went back to buy another pair and they no longer carry that style. Well luckily Best Buy had most of the colors in my size. I wear 11 M. In short, now I have 6 pairs of different colors. They fit just right. If you use very thick socks I would suggest going half a size up. The only problem with them is what color I want to wear today. Very comfortable and easy to get in.