I bought the Off-Road Croc for my husband, he wears a 9.5 to size 10 shoe.  I ordered the size 10 Croc and his foot just swims in the shoe.  I had him try on my size 5 beach Crocs and they almost fit, so it sounds like I should have ordered at most a size 8 rather than a size 10.

As this was a gift the shoe size charge was of limited assistance (in addition to being generally confusing).

Except for the swimming in the shoe my husband likes them and he is a person who is pretty particular about his shoes.  They really are not rated for "Off Road" because you toes slides forward and hits the end of the toe box anytime you go down a slope.