Thank you for viewing. This is a waterproof cover for Shimajiro. By wearing it over pajamas, you can protect the futon from bedwetting. The target age is around that of Kodomo Challenge, but my slender son wore it until he was in second grade. It has been used, so please check the condition in the photos and understand that it is a used item. I would appreciate it if you could comment before purchasing. Thank you very much.