Great Hat for Hiking/Backpacking
I've had this hat for about a month now and it's already ridden atop my head along trails in the Grand Canyon and Virginia's Grayson Highlands. It's lightweight, provides protection from the sun, and is nice and breathable to keep my head (relatively) cool. The dark color (Collegiate Navy) I ordered probably gets a little warmer than some of the lighter colors when you're out in the sun, but overall my head stayed well-ventilated. When rain came in Virginia, the hat alone was enough protection for light rain and great under the hood of my shell when it started pouring, with the bill keeping the diagonal rain off my face.
Without a flexible tape measure, I guessed at my head size when ordering and got a Large--the Regular would've probably been fine given the hat's adjustability. It's been stuffed into packs and knocked around quite a bit in its first month of use and doesn't show any signs of wear--I look forward to wearing this hat for a long time.