Thorium Vest Women's is a warm, versatile down vest designed for trail use, travel, and commuting. Product Type: Women’s insulated down vest Material: Down Fill 750 fill-power Responsible Down Standard certified grey goose down for warmth Down Composite Mapping™ uses Coreloft™ synthetic insulation in moisture-prone areas Arato™ 30 nylon shell with a DWR treatment for water repellency Pair it with a women’s fleece jacket and a beanie for cold trail days and commuting. A warm down vest – it’s a winter necessity. Born from an alpine-proven design, refined to perform as a versatile standalone, the Thorium is the one you reach for before stepping out into the cold. The 750 fill-power Responsible Down Standard certified grey goose down delivers excellent warmth for its weight. Down Composite Mapping™ strategically places Coreloft™ synthetic insulation in areas prone to moisture, the bio-derived liner reduces petroleum use, and the light, durable Arato™ 30 nylon shell has a DWR treatment for water repellency.