I've used these as running shoes for about a year. Although not every day, I've run on muddy roads, so there's some dirt. The laces are a cute, fluorescent ribbon-like material, and I bought them thinking they'd be good for visibility when running at night. They show signs of use, but they're still in good condition, so I'm putting them up for sale. I plan to wash them before shipping, just to be safe. They fit my feet lightly, so they're very comfortable to wear. Size: 23cm