Arc'teryx Atom Hoody MThe Atom Hoody is the solution to your which jacket should I wear? problem. Wear it solo for chilly forest hikes with windy summits, climbing at the crag, and hanging at the campsite, or as a midlayer for touring and wet winter objectives. The Coreloft synthetic insulation stays warm even if you run into light weather, making it a better alternative to down for high output days year round. Moisture resistant outer face fabric Breathable Lightweight