Funny how the temperature always seems to drop about ten degrees and the winds pick up by a few miles per hour as soon as you gain the summit. In moments like these, you'll be glad you packed your Arc'teryx Women's Cerium LT Hooded Down Jacket. Insulated with a combination of highly compressible and insulating 850-fill goose down through the body and water-resistant Coreloft synthetic fill in areas prone to moisture, the Cerium delivers reliable warmth at the most crucial moments of your adventures. When you are sitting on a cold and windy summit, the adjustable StormHood and cuffs help trap warm air next to your body while simultaneously keeping the elements out. And since this version of the Cerium sits at the lighter end of Arc'teryx's Cerium line, you don't have to worry about this jacket adding too much weight to your pack.