Because of prior sizing issues with this manufacturer, I bought both 39 and 40. The 39 was true to size: I typically wear 8-8.5 in dress shoes. I have flats from this manufacturer as was looking for something with a little bit more character and with heels that could withstand the Florida rains. However, something about this style and the wedge sandals just did not fit right. Also too much noise when walking on carpet even with correct size shoes. Returned them. Will be staying with the flat sandals.