This particular style is one size fits most, but features an inner drawstring to ensure a secure fit. Made from soft, 100% wool, this hat is great for sensitive scalps because it won't itch or scratch. Our Wool Selene Cloche Hat is cut deep to provide total head coverage, ideal for women with hair loss due to cancer, chemotherapy, alopecia, or other types of medical hair loss conditions. It's also a beautiful choice for women with hair as well. This particular hat is recommended for women with petite to average head sizes. We love this stunning simplicity of this style and know you will, too. It's a timeless piece that you're sure to want to wear over and over again!