Nano Ultralight Down JacketFinally, a down jacket that won’t lose its feathers. A state-of-the-art stitchless design using Arc Welded Technology™ eliminates escape holes. Packable, light, and warm this stylish down design features: 800 fill power synthetic down that stays warm even when wet. Covered with a durable water-resistant (DWR) lightweight exterior shell. A contoured fit to reduce bulk and maintain loft and a zippered chest pocket for secure storage. Warmth sealing stretch cuffs.