I loved this hat, but I had to return it and buy the XXL. The sizing is hilariously small. It's intended for sizes 7 3/8 - 7 1/2, according to the description.
I'm hat size 7 3/8, and the hat was so small that I could barely jam it onto my head, and I got a headache and a giant red stripe on my head within a couple minutes.
So I returned it and got the Hoff XXL. I should note the size description on the XXL is also inaccurate. The XXL says it's for "7 3/4 - 7 7/8." Again, I'm a hat size 7 3/8ths. The XXL is also tight on my head. Not uncomfortably so, but I wouldn't recommend it if your head is any bigger than mine. Size 7 to 7 1/4 would probably be more accurate.
It's a great hat. That's why I gave it 4 stars. But they really need to update the sizing on both this and the XXL. It's simply inaccurate.