Worn As A Mid Layer Or Standalone Piece In Cool, Dry Conditions, The Cerium Lt Jacket Delivers Exceptional Warmth For Little Weight. Premium 850 Fill Down Is Resilient, Lofty And Warm. The Arato™ 10 Shell Provides Lightweight Durability, And Down Composite Mapping™ Strategically Places Coreloft™ Synthetic Insulation In Moisture-prone Areas. Articulated Construction Moves With The Body, And Sewn-through Construction Is Used To Further Reduce Weight And Increase Packability.