I've only worn these about 5 times since I bought them, so the soles (underside) are clean. However, the inside is dirty, possibly due to poor storage. (The insole is made of paper.) It's difficult to see in the photos, but there's some discoloration on the left shoe! They're still wearable, but those who are particular might be concerned! Feel free to ask any questions ( ´∀｀)