I initially bought these in a 10 because they don't offer half sizes, and I'm normally a 9 1/2. Sadly, it was a bit too big, although I still could have worn these without too much difficulty due to the ankle strap. Returned them for the size 9, and they fit just right! If you're like me and stuck between sizes, I'd recommend going to the lower size, especially because your foot will likely slide down towards the front since it's a medium heel.