My son got his first pair of crocs a little over a year ago and he's been hooked every since. He's only 3 and he's already owned at least a dozen pair. I can't hardly get him to wear anything else. Back in November my mother bought him a pair of the mammoth crocs with the fur lining. I knew as soon as he opened the package that these were going to be his favorite.
After 4 months of wear, I have to admit that they are really nice(I don't really care for crocs myself). The fur lining keeps his feet warm and they are very durable. If they get dirty, which they do a lot, I can usually just rinse them off or soak them overnight in the sink. They always come out looking new. The only thing I don't like about this style is that they don't have a back strap. I think younger children really need that to keep them from scooting their feet all the time.
But, they keep him happy which makes me happy. It will probably be a fight to put them away for the summer, but I'm sure he'll find another pair that he's just as happy with.