I received these as a gift for my child's birthday, but they didn't fit, so I've been storing them. I haven't worn them outside, but after storing them for a while, there are some stains on the insoles. See photo 4. Other than that, there are no noticeable stains, but please understand that these have been stored at home, so please purchase only if you are okay with that. Pets: None Smokers: None