One size fits most and has plenty of stretch. This hat measures 9 inches long by 9 inches wide lying flat Made of 100% polyester is good for both inside and outside. It is machine washable and hung to dry. New with out tags All Items are sold as is. I try to describe the item to the best of my knowledge, but being only human I might miss something once in a while. I combine shipping, if purchasing more than one item please contact me before paying so I can combine them on the invoice. September 2023