In a perfect world, brands would keep their sizing consistent. If a girl owns three pairs of size 8M crocs, and all three fit wonderfully, she should be able to expect that the next pair of 8M crocs would fit the same. Sadly, this isn't the case. The cut of the Rio is a huge disappointment. The foot bed is very narrow (but the strap fits just fine and would be large on a skinny foot); these are longer (who has toes this long?!), and strangely shaped at the toe (I've never seen anyone with feet shaped like these crocs). In any case, I'll keep them in my car as my pedicure sandals and be thankful that I didn't spend much on them.