The shoe caused extensive blistering on my recent vacation.  The problem was not that they are made large, but a strange construction or design in the back of the shoe.  Basically, at the base of the top side of the heel on the outer side, there is a plastic supportive piece th a t digs into the side of your foot.  I could feel it at first use, but it did it's extensive damage after extensive use.  I should add it was identical on both feet.  The guilty piece is tge black strip at the back of the shoe.<br /><br />Absolutely dont buy if you pl a n to use it as an extensive walk7ng shoe.  Based on the design flaw, thick socks won't even help.