I was super excited to find this hat and to order it since I've been looking for a wool version of a cadet cap I already have. This is the only one I could find that was enough wool for a decent enough price to try. When it arrived, it was vastly over-sized. I have half a dozen hats (fedoras, porkpies, etc.) and more than a dozen bike helmets that have all been size medium and none were anywhere near this big. I ended up needing to put 3/16 thick foam weather stripping all the way around inside the headband to get it to fit (although it still looks a little large). If OR is going to make a quality cap that is so oversized, they need to at least offer a small (which I would have gladly exchange for, but not an option). The other odd thing, that I didn't notice when I ordered it is that the lining is 100% cotton, which sort of ruins any chance of using it as a hiking cap in drizzly weather, which is why I wanted it in the first place. Guess I'll keep looking.