Light, warm, and highly packable, the Arc'teryx Women's Cerium Down Vest is a versatile layer that shines as an alpine midlayer or as a standalone piece in cool, dry conditions. Weighing just grams and packing smaller than a grapefruit, this vest provides premium warmth with responsibly sourced 850 fill European white goose down. It features Down Composite Mapping™, which strategically places Coreloft™ synthetic insulation in areas prone to moisture buildup and down in areas for maximum warmth and layers comfortably under a shell, making it an essential for any adventure.