Arc'teryx Cerium SV Hoody Women's Arato 7 & 10 - 100% Nylon CERIUM SV HOODY - The Cerium SV is the warmest Arcteryx down midlayer and a versatile standalone in frigid, dry conditions. ARC'TERYX ESSENTIALS - Versatile high performance designs for diverse activities and conditions. CERIUM - Streamlined, minimalist and lightweight technical down insulation. High warmth to weight ratio. DOWN - Highly efficient natural insulation that compacts well and offers excellent warmth to weight. SEVERE WEATHER - Most durable materials and weather protection, for prolonged exposure to severe conditions.