These fleece-lined slippers have a vinyl backing, making them suitable for both indoor and outdoor use. - Design: Pochacco - Brand: Sanrio - Size: 19cm. They should fit children who wear 18cm shoes as well. My daughter wears these outside like Crocs, even in the current weather. Although they are unused, please understand that they have been stored at home. They will be shipped in a plastic bag and mailed via post. Also selling 20cm My Melody slippers. Thank you for looking.