I've only used these once, but the day was on difficult terrain and the weather was bad, so there are some stains that won't come out even after washing. However, the inside is quite clean. Also, they have insoles made of the same material as recovery sandals, so the comfort is, in my opinion, among the best for trekking shoes. I'm selling them because the size didn't fit me, but I'd buy them again if I could find my size. They're sold out on the official online store, and you rarely see them in stores or on Mercari, so if you're looking for them, please experience this comfort for yourself. These are used items, and there are no accessories such as a box, so please purchase only if you understand this.