Exceptionally versatile, hard-wearing and warm, the Thorium women's hooded down insulated jacket can be worn as a warm mid-layer or standalone piece for cool, dry conditions. Its regular fit is streamlined and layers easily under a hardshell in cold conditions. The lofty 750 fill-power goose down gives incredible warmth for little weight, is durably resilient, and packs easily. Layering is the key of keeping you dry, warm and using your energy efficiently. Put into the right systems, a good sequence of layers moves moisture away from your skin, conserves or dissipates heat and provides you with weather protection. Here they are. The first layer, worn next-to-skin will provide warmth and quickly move moisture away from your skin. Then, the second layer, is the insulation and fleece, that provides warmth while also dissipating heat during periods of high output. And finally, the third layer, the shell, which is the most weather-protective layer, worn on the outside of all other layers.