I'm a solid size 7 US and bought them in a 38. My heel hangs off the back. I didn't exchange due to cost of return shipping but I may try buying a size larger. There are no half sizes. I love them but won't be able to wear them.
Thank you for your feedback! We apologize for the size issue you encountered and understand your concern about the return cost. Please note that we accept exchanges within 14 days of delivery date on size issues (unless purchase has been made on a sale). Do write to us to check about it on email@example.com.