Susan
Crocs aren't regional in the USA, they are immensely popular here in Canada as well (and have been for years). I'm a late bloomer and just started loving them. Best thing is .. they are so light. A lot of doctors and medical personnel in hospitals here wear them. They come in all colours, and there are lots of cheaper knock-offs sold.
I was at a dressy party last week and saw someone wearing them with an elegant pant suit. It is an addiction, like TOTV. Watch out. You too will be wearing Crocs to bed.
I just bought something yesterday called Okabashi, they look like crocs, but a little more elegant design in sandals, perhaps it is the wave of the future. :-*