MontBell UL Down Vest
Where to Buy
Here's what other sites are saying:
Mont-Bell U.L. Down Jacket weighs less than most cotton T-shirts, blocks a deceptive amount of wind, while compressing to the size of a 32 ounce water bottle. Specifically designed as a replacement for the heavy and bulky fleece garments used by many backcountry enthusiasts, the U.L. Down Series is what you need when warmth is critical, minimal weight is paramount, and space in your pack is at a premium.
MontBell's U.L. (ultralight) Down Vest is "what you need" when warmth is critical, minimal weight is paramount, and space in your pack is at a premium-it weighs less than most cotton t-shirts, and compresses to the size of a 32-oz. water bottle.