Patagonia's Men's Ultralight Down Jackets have become a fixture at the crag, on the portaledge, and in the alpine. Not only does the jacket look nice when you're in town, but it was built to perform in serious mountain environments. 800 fill European goose down traps an incredible amount of warmth, while the 15D Pertex Quantum fabric keeps the weight at a minimum and helps to maximize loft in the down. Since the jacket is highly compressible, you'll always have space to bring it along. The shell is finished with a DWR treatment, so a little moisture won't rob your warmth.