Outdoor Research Helmetclava
Here's what other sites are saying:
The Outdoor Research Gradient Hat features classic style with a twist. The warm wool of this hat keeps you focused when blast of cold air threatens to chill you to the core as you check your route bearings. Keeping you toasty and protected, this hat's impermeable boiled wool never lets you down; just like your spot-on internal compass. You're still on the right track as you push on towards the trails' end.
The Outdoor Research Helmetclava uses panels of different fabric so you get protection in the places where you need it most, and you get flexibility and useful things (like hear-ability) in the places where you don't.