Pay attention dear, the zipper boots are a big drop. Most of them go down, which means if you are between 38 and 39 you are almost certain you will need 38. Unless your foot is very wide. But if normal then choose the smaller of the two dimensions. For example, I am between 36-37 and I took 36. In addition, you must use the scale bar. Foot length measurements from the toe to the heel end. The zipper boots in the size chart are on a low heel.