Dear Customer : Thanks a lot for choose our ZHIのJIA brand ! Here are some tips about size before you buy it, Please choose the shoes size according to your foot length, NOT insole length. If your feet is wide or thick, please choose a larger shoes size. Before choose your size , you'd better measure your feet length. For example, if your foot length is 25 cm, you'd better choose size 41. How to Measure Feet Length Please measure your feet length carefully, with the method of the picture below: