Used about 5 times. I don't think I've worn them even that many times. Vans slip-on beige, 22cm. The black marks are dirt that I think can be removed with an eraser or by washing. I tried a little and it came off. Please wash them after you buy them!! There are other stains, but they are almost unused. I've only worn them for a short time!! The shape is unchanged and they are still in good condition.