I ordered the play on style ( black/black).I listened to reviews and went a 1/2 size bigger and it was a MISTAKE. They were too loose. My heel had to much space to slide around. I can say though that the memory foam is awesome. Very light and nicely padded shoe. I re-ordered them in my usual size 8. This particular style (black/black)  is kinda cute with a gem on tongue and reflective dots on sides.