The Patagonia nano puff or should I say a mini sleeping bag that fits in my wallet, is one of my favorite articles of outdoor clothing. The super lightweight highly compressible material is perfect for insulating during winter fly fishing or a cool summer evening. The Nano Puff is not bulky at all and fits under your outer layer with style. Another bonus is that they come in some bright colors that will lighten up your drab fly fishing outfits. Bright green, orange and blue are a couple of my favorites.
I fell into the Alagnak River in AK a few years ago with my nano puff on. Not just a little damp, I fell into the river off a boat and had to swim to shore. I was amazed how quickly my Nano Puff dried out and kept me warm until we reached camp later that day. I would recommend this article of clothing to anyone looking to beef up their layering system.