The Ortovox Downwool 180 Jacket blends 70% down with 30% alpine wool to solve a problem standard down insulation can't handle well: staying warm once moisture gets in. The wool absorbs that moisture and helps the down loft up to 30% more, so the jacket holds a steady warmth through strenuous climbs or a light rain instead of collapsing flat. A windproof, water-resistant recycled outer rounds out a jacket light and packable enough to wear under a shell or on its own, in any season in the mountains. What Our Gearhead(R) Experts Are Saying:"I sweated straight through a steep climb in this jacket and it never went flat on me the way a pure down piece has in the past. That's the wool doing its job, pulling moisture off the down before it can kill the loft."