The lightest down piece in this collection. Streamlined, lightweight down jacket filled with 850 white goose down. This backcountry specialist jacket is intended as a mid layer or standalone piece in cool, dry conditions. The lightest down piece in this collection functions as a warm mid-layer or standalone piece. Down Composite Mapping strategically places Coreloft™ synthetic insulation in areas where moisture may buildup; down in the core and the hood gives maximum warmth.