I used these shoes indoors once a week for almost a year. As you can see in the photos, there are no noticeable stains on the visible parts of the shoes, but the soles are a little dirty. The white areas, such as the mesh, appear slightly yellowed. Overall, the shoes show signs of use. My name is written on the inside of the shoes (near where the size is written), so I will erase it with a marker before sending them. Thank you.