I am a huge Crocs fan! They are the best things ever for feet, ankles, knees, backs etc. I've got 5 pairs, all with Jibbitz (charms) and I love them. They keep your feet cool in summer and warm in winter. We went trekking in the forests in India and they were brilliant as they are very light and robust.
You can wash them in a weak solution of bleach or disinfectant - the blurb on them says they don't stain but they do. My purple ones are stained from the red dust in Goa and although it has faded you can definitely see it.
I can't speak highly enough of them, so much so that I have a pair of Aspens on order and will be getting a pair of of the Athens sandals!