The Arc'teryx Cerium Vest is the ultimate minimalist midlayer that's packs so small you'll always be able to find space for it. It is designed with responsibly-sourced 850-fill down and strategically reinforced with Coreloft™ synthetic insulation in moisture-prone areas. Its sleek design effortlessly fits under a shell, and when it's time to hit the road, simply stow it away in the included stuff sack for easy transport on your next adventure.