You know it's getting cold outside when you can see your breath hanging in the air. The Jack Wolfskin Atmosphere Jacket is the go-to jacket for sub-zero temperatures. The ATMOSPHERE is the lightest down jacket in their the collection and has a RDS down fill to keep you warm. The STORMLOCK shell provides double protection: it shuts out the wind and shrugs off light showers.The ATMOSPHERE is also extremely breathable, so it's ideal for all kinds of winter sports, from X/C and downhill skiing to snowshoeing. And if you get too warm, simply stash it in the stuff sack and drop it in your pack.