I bought an 11 for my husband who normally wears a 10.5, and they just barely fit. If you're a half size, go up!

These mules are kind of dainty.  My husband was wearing them when we were playing outside with our toddler.  He knelt down on the concrete to talk to her, and the thin fabric on the trim on the front of the shoe just shredded.  Not what I expected out of $100 shoes!