what is the sizing for a medium or large hat? Is this hat crush proof and packable?
I can't address the size question b/c I don't quite understand it. Mine fits well. I need a large and it is comfortable. I keep mine in a backpack pouch that doubles as a fanny pack, so I fold it twice. I would not place it under something with a lot of pressure on it, but when I take it out of the pouch it returns to its original shape. And it is definitely waterproof. It was a lifesaver during a rugged trip through the Philmont Scout Ranch in NM last summer. Really glad I had it. The wide rim is excellent at keeping the water away from your neck!!