I don't know if these were incorrectly sized at the time of production or if the manufacturer doesn't know US shoe sizing, but these were at least one full size smaller than the size indicated on the shoe.  I ordered a size 7, which has been my shoe size since I was 15, and I could barely get my foot in these.  Once I managed to squeeze one on, my toes were literally jammed right up against the inside edge. I tried these with bare feet too. No socks or anything else to take up room. Returning.