After wearing these sandals on average once or twice a week for 6  months, I still have the problem of the black color rubbing off onto my heels. I wear little black foot peds or whatever they are called and the black dye rubs right through. I have to really scrub my heels to get it off. And strangely, the right strap that goes over the instep is shorter than the left sandal, which is the correct length. The right I have to really tighten to keep it on. My other Naturalizers are just fine. But, wow, the things people put up with (in the category of unimportant, daily living things; but then you do want what you pay for to be right . . . oh, well).