Snoozies Womens Nubby Knit Ballerina Comfort Sole Slippers 100% Polyester Made of polyester with skid resistant sole Ballerina style with soft pom pom sherpa fleece lining Womens shoe sizes - US size scale as follows: small: 5/6, medium: 7/8, large: 9/10, extra large: 11/12 Comfort split sole with memory foam insert and foldable arch Machine washable