1. Please measure the length of your foot correctly, then refer to the size chart to select the correct size. 2. The width of this shoe is Medium(M/D) . If your foot width is Medium(M/D), please choose a normal size. 3. If your foot is Wide, please choose a size of big one. 4. If your foot is Narrow, please choose a size of small one. 5. When you have any size problem, please contact us first, we will help you solve it in the first time.