Alpine-ready for winter layering and shoulder season summits the the iconic Cerium is made for backcountry missions. When you want to ward off the cold the Arc'teryx Cerium Women's Jacket features a refined design and more sustainable materials. Delivering outstanding warmth in a jacket that packs small and weighs just 255 grams this is the perfect piece for the person who approaches the outdoors with enthusiasm. With responsibly-sourced 850 fill down throughout all but the areas prone to moisture, where Coreloft™ synthetic insulates even if damp and moves vapor quickly this is built to keep you warm… under a shell in weather, on its own when it’s chill out there.. The recycled 15D Arato™ nylon outer is light and durable, and a bio-derived liner made from 60% castor bean oil to reduces petroleum use this is a piece you can feel good about owning, that will make you feel good when you need airy warmth!