Amazon recommended a 9, but I got 8 1/2 anyways and was very happy I did. These shoes are awesome for light working out like walking/jogging and they have a nice bounce to them. The color is poppin and just what I wanted. They fit soft and flexible like a sock. I wouldnt recommend wearing thicker socks with them if you get your true size. The price wasn't too bad either.  They look cute with skinny jeans for a casual day at the office too- of course they look stunning with black leggings for workout.