The Arcteryx Cerium Jacket is a lightweight stitch-through down jacket that uses the finest 850 fill power European white goose down, ensuring super lightweight warmth for those on the move. The Cerium offers superb mobility and and can be used as either a warm mid layer or as an outer layer in cooler conditions. This is the perfect choice for the ski tourer or alpine climber requiring warmth, and packability at a minimal weight. Down Composite mapping (DCM) is utilized in the Cerium Jacket. DCM is where synthetic insulation is used instead of down in areas prone to moisture - the collar, chin, underarms and cuffs. These areas are also prone to down migration so the use of synthetic insulation eliminates this problem as it remains static within the jacket. Down is then used throughout the core and arms, where warmth is required the most. The outer fabric of Arato 15 is durable yet is still incredibly lightweight and also benefits from being DWR finished. The liner is a Recycled Arato Bio fabric that is light and comfortable. To keep drafts out the cuffs are elastic and it has an adjustable hem drawcord. It features two zipped hand pockets and an internal security pocket. The jacket comes with its own stuff sack for easy rucksack transportation. Arcteryx Cerium Jacket Features 850 fill power European down Arato 15 outer fabric with a DWR finish Down Composite Mapping Front zip with chin guard and wind flap Elastic cuffs 2 zipped hand pockets 1 internal zipped security pocket Stuff SackElastic cuffs Adjustable hem drawcord Fit:Trim, hip length. Weight:330g Arcteryx Cerium Jacket