The Cerium Vest delivers exceptional warmth without the weight when the temperature drops. 850 fill European white goose down traps heat where you need it most, while strategic Coreloft™ synthetic insulation protects moisture-prone areas against damp conditions. Wrapped in a light yet durable 15D Arato™ recycled nylon shell, it serves as a streamlined alpine midlayer or a quick-deploying standalone during trail breaks and cool camp nights.