Bought this for my husband as he loves 'Fedoras' but needed a more 'Summer' hat instead of his usual Wintery Wool Felt. He fell in love with this hat... so much lighter, and cooler, than the Wool Felt. His Head Circumference is 22-1/2" and I ordered the LARGE... it fit him perfectly. I'm going to order another and keep it in the closet for future use cuz, dontcha know, just when you find a product you love, they discontinue it. HIGHLY RECOMMEND.