The Arc’teryx Men's Cerium Jacket packs down small, is lightweight, & provides lofty down warmth, making it the perfect insulator for alpine & backcountry adventures. Down Composite Mapping strategically places Coreloft synthetic insulation in moisture-prone areas for durability, while responsibly sourced 850 fill down provides premium warmth everywhere else. The streamlined design is articulated for freedom of movement with a slim fit for comfortable layering. Zipped hand pockets & an internal zipped pocket mean you can always keep snacks on h&. Ready when you need it, the Cerium can be stored in the included stuff sack when you’re not wearing it.