I did size down! It was pretty tight in my toes but my heel still slipped out! It might just be the PVC style, I’m not sure if it just doesn’t grip the heel as well? I’m truly not sure, I figured maybe someone on this thread might be able to enlighten me! I was considering trying a size down but they were already fairly uncomfortable at the toes at this size..I got them through a SA at Neiman/Bergdorf. Her name is Adrienne and her Instagram is @adrienne.az. She has been super helpful! Good luck and thanks for your thoughts!