Thank you for viewing. I am selling this because it is the wrong size for me, and I have only used it once. I think it's perfect for head sizes of 30-50 cm. Judging from various product reviews, some people feel it runs a bit small. I have sterilized it with high-heat steam and placed it in a zipper bag before listing. I think it's perfect for children with small heads. Thank you. Feel free to negotiate the price!