These are a lot more narrow than an American sized shoe.  I wear a 10.5 U.S. normally, but I bought an 11 in this shoe.  The size (in terms of the length) was right on.  They were actually a little to long - which I would expect with an 11.  However, the width was so narrow that I could not put the shoe on.  So, if you have a wide to extra wide width foot, then this is not the right shoe for you.