men's skechers with archfit. size, usa: 9½. have honestly never been worn outside of the house, just tried on in the house. they were for my pap who's 90 and he didn't like them. not sure what is on them since he hasn't worn them anywhere, I believe it's from sitting in a hot closet and possibly from the fabric itself, since it's all down the inside of both shoes. there's a little stain, as seen in the pictures, on both shoes, on the inside where the fabric meets the rubber, and it will not come off. I've tried bleach and a ton of other cleaners, and nothing took it away, just faded a little, which is why I believe the stains are from the fabric.