The reviews saying that the Run Happy Sherpa hat from Brooks was way too big tipped me off that it would be perfect for me and my large noggin!
My almost size 8 head *barely* fits into this hat (but it does) with the adjustable portion at the highest setting. A little bigger would have been nice, but this is a-okay.
I got the black hat on discount (regular price of $30 is too expensive), which is great, except it feels like it attracts the heat a little. However, the hat is very light, wicks away sweat wonderfully, and dries quickly. And it doesn’t retain much odor, which is quite different from running in a baseball cap.
You can find the Run Happy Sherpa hat here.