Don't really know if it is Amazon's fault or the retailer's.
Here is the problem:
When you go to pick the size you want, they give you small, medium, large and extra large to choose from.
Of course you need a way to relate to those categories so you go to the sizing chart and when you get there there is no mention of the small through extra large, just regular American, European, even measurements in inches; but to relate these other sizing charts to the S-XL sizes is a pure guessing game.
I should have called the  company before making my order, I guess. Now I will have to ship them back.
BTW, size 10.5 in women's (9 in men's) is an XL.
Dissappointed that they changed the style slightly also - the toe now curves up a bit when before it was very flat.