As A Mid Layer Or Standalone Piece In Cool, Dry Conditions, The Cerium Lt Jacket Offers Exceptional Warmth For Little Weight. Premium 850 Fill Down Is Resilient And Warm, The Arato™ 10 Shell Provides Lightweight Durability, And Down Composite Mapping™ Strategically Places Coreloft™ Synthetic Insulation In Moisture-prone Areas. The Women’s Specific Trim Fit With Articulated Construction Moves With The Body, And The Sewn-through Construction Further Reduces Weight And Increases Packability.