The other reviews are correct, the hat runs big. I bought a small and wear a 7 1/8 PC, I had to do attempt to shrink it as much as possible to make it work although it is still a touch big. I do love the weight of the hat and the thin bill, but the pattern has a small signature on it that makes the headgear unauthorized (from the pattern creator I assume to avoid copyright issues with the actual pattern). You can not see it in the picture only in person, and it is too noticeable for me to forgive or look past. Frankly, its annoying and I will likely never wear this headgear because it is out of regulation (AR 670-1), which I did not realize until I saw the headgear in person.