I wear a men's medium helmet for snowboarding. I had high hopes for this beanie, and was sorely disappointed when it arrived. The hair looked hilarious, but it was too loose to wear practically, and there was no lining, so your scalp is up against the cloth they anchor the hair to, which is very rough. It could have fit more snugly, in my opinion, and fleece lining would have been a great buffer between your head and the carpet-bottomside crown of the beanie.