"One size fits all" but still it looks giant on my head, and I think I have a rather large head. Compared to all other caps I own this one looks ridiculous. Love the design, colour, etc, just wish I could wear the damn thing. Since I live on the other side of the world and can't be bothered to send it in return it will sit on my shelf incase I get some kind of head tumour and my skull will grow in size :))))