My daughter has narrow feet, but this boot still seems to run big.  I know that Crocs can vary in size (even within the same size between pairs)...so maybe we just got a bigger than normal pair.

But...that being said, it's great that they are unlined.  My daughter can splash in puddles and get wet inside and out...and then we just have to dump the water out and dry them...no waiting around for wet inserts/ liners to dry!

Definitely recommend.