Shawn J.wrote a review of Patagonia Nano Puff Pullover Insulated Jacket - Men's on November 10, 2009
This sucker is super light and packable. But that's obvious. I wear a medium in most outer wear and got the medium in this coat. It fits perfectly under my Norrona Falketind jacket (size med.). I think this will be a good combo for those super-cold storm days.