I purchased these from a kimono shop in August of this year for 5700 yen, but my family only wore them for about an hour. I'm not sure of the material, but I think it's synthetic leather, so you should be able to wipe off any dirt. The thong is made of white and black fabric. The underside is new urethane. I would be happy if you could use them. Thank you very much. Please feel free to comment if you have any questions.