There's no question that mountain weather can be fickle at best. From freezing temps and howling winds to bright, sunny, and warm, the upper elevations of any mountain range can produce it all, so be prepared for the cold with the Patagonia Men's Ultralight Hooded Down Jacket. Lightweight, stowable, and ultra warm, the Ultralight Hooded Down Jacket delivers on demand warmth with almost no weight penalty.The jacket's lightweight 15 denier Pertex Quantum fabric resists tearing and promotes more loft from down clusters. It is also treated with a water resistant coating to protect the down fill from moisture. The European goose down insulation not only delivers supreme warmth, but it can be traced back to birds that were never force fed or live plucked. The insulated hood can be adjusted with a single pull and will be a welcome feature when you're on belay, weathering a storm at a mid mountain bivy, or just enjoying your morning tea from base camp. When it's time to pack up, simply stash the jacket in the included stuff sack and throw it in your pack.