Whether you're navigating alpine routes or layering for everyday adventures, the Arc'teryx Cerium Jacket delivers championship-level warmth without the weight penalty. This technical powerhouse uses innovative Down Composite Mapping™ technology to strategically place 850-fill European white goose down where you need maximum warmth, while synthetic Coreloft™ insulation guards moisture-prone zones like shoulders and cuffs. At just 10.6 oz, this incredibly packable jacket disappears into its included stuff sack when not needed, yet provides serious insulation when the temperature drops. The fitted profile slides seamlessly under your shell jacket or over base layers, while the recycled Arato™ nylon shell shrugs off wind and light moisture. From multi-pitch routes to winter commutes, the Cerium proves that you don't need to choose between packability and performance – you can have both in one expertly engineered piece that's ready for whatever your next adventure throws at you. Features Down Composite Mapping™ strategically places synthetic insulation in moisture-prone areas and down in areas for maximum warmth Articulated patterning provides unrestricted mobility for technical activities Fitted design optimized for seamless layering in technical clothing systems Two zippered hand pockets plus internal security pocket for essential storage Includes stuff sack for compact transport and easy packing Adjustable hem drawcord for customizable fit and weather protection FC0-DWR treatment provides water-resistant protection RDS-certified down and Fair Trade manufacturing ensure ethical sourcing Specification Value Weight 300g (10.6 oz) Fit Fitted Fill Power 850-fill Down Weight 109.73g (3.87 oz) Synthetic Insulation Weight 100g/m² and 80g/m² Materials Outer: 15D Recycled Arato™ Nylon | Liner: 20D Plant-based Arato™ Nylon | Insulation: 850-fill European White Goose Down + Coreloft™ Synthetic
