I am a girl with a big dome. My head measures 22 3/4". Most women's hats don't fit.  And, if it says One-size-fits-all, it generally means if I try to wear it, I am going to end up with an Excedrin headache.  Well, this cap fits my noggin, and it looks cute! It also has a good-sized brim to keep the sun off my face. It's my go-to cap for all outdoor needs.  Love it!  So glad I wasn't dissuaded from buying this hat.  I'll be getting another color in this same size/style!