I am always leery about buying 'one size fits all' hats on line. I have a rather large hat size (usually 7 3/4 if the hat comes in number sizes). Most of the time, one size fits all means everyone except me. Well, this hat fits great, however it does not completely cover my ears. The lobes are left exposed (therefore the 4 rating). If you have a small hat size this might be too large for you. It is a lighter weight than other fleece watch caps I have had, making it very comfortable