The Cassiar Pro ODX Shell centers on OutDry Extreme technology, an external membrane bonded directly to the fabric so rain has no seam or stitch line to work through. Built for elite hikers facing fast-changing mountain conditions, the shell keeps moisture out while a wicking interior layer manages perspiration during steep climbs. What Our Gearhead(R) Experts Are Saying:"When wind kicks up on a ridge, I cinch the drawcord hem and let the partial elastic cuffs snug down, and drafts stop finding their way in. That quick adjustment is what keeps the rest of the shell working the way it should in changing weather."