The Cerium has exceptional warmth and hardly weighs a thing! Designed for wearing on cold, drier days this micro baffled jacket is packed full of goose down which is resilient, lofts well and incredibly warm as soon as you put it on. For moisture prone areas like the hood and cuffs strategically placed Coreloft synthetic insulation has been used. The Arato nylon outer provides durability but is light to the touch. The Cerium LT is wind and water resistant with a hood that fits well around the face, is adjustable and can accommodate a beanie for extreme cold conditions. Updated with a slightly longer length, this jacket is also slim fitting so it can be worn under a waterproof shell in stormy, wet weather. As well as two zipped outer hand warmer pockets, the Cerium has an inner security one which also acts as an integrated stuff sack for excellent space saving when packing in the rucksack.
For a synthetic alternative, why not look at the Atom LT Hoody