Please be sure to read the profile. Size is 18cm. I washed it lightly, but some soil remains. I'm not sure if it's dirt that will come off or not, but I feel like it might come off a bit more with something like a scrubbing pad, but I'm not sure. I've used it for things like digging up potatoes. Because of the material, it doesn't easily conduct heat, so I used it on snowy days too. Anyway, it's light, and my child has been repeatedly using Crocs rain boots. Please refrain from purchasing if you are looking for perfection. I'd like those who think it's okay if the rain boots are a little dirty to purchase them. Simple packaging. Please search for C11 on the Crocs official website for the size. I purchased it because it was said to be 18cm in Japanese size, but it might be slightly different from the Japanese size.