Patagonia - M's Dual Aspect Bibs - Smolder BlueOverview The Dual Aspect Bibs are a waterproof breathable hard shell built for alpine climbing in the harshest conditions. They feature a combination of full storm protection for the worst possible weather, a construction designed specifically for freedom of movement in the mountains, and a materials package made without perfluorinated chemicals (PFCs PFAS) is an important step forward in creating highly technical products with lower impacts on the