This is the standard universal chart for shoe sizes. We can not guarantee the size online or on phone orders. New clogs always need to be broken in. As you wear them, the upper leather will mold to your foot. If you wear a US woman's size nine, order the European size 39. If you have high insteps, we recommend that you order one size larger than what you are normally wearing. We carry whole sizes only. If you wear a half size, you should always order the next largest size. For children we suggest ordering one or two sizes larger than what they currently wear. However, for a very young child, at the most one size larger.