The Patagonia Nano Puff jacket is a water-resistant, windproof jacket featuring a lightweight and highly compressible insulation that makes it ideal as outerwear or as an insulating layer in the coldest of climates. You'll appreciate the warmth afforded by its hydrophobic Primaloft Gold insulation, which traps in your own heat and continues to insulate even when wet, making it ideal for inclement weather.The shell features a water repellent finish that not only sheds water, but glides against other fabrics, making it perfect for layering against the cold. A soft, moisture wicking interior makes this layer a no brainer for mountain wear. The jacket stuffs into an internal chest pocket for easy storage, so you can keep it close at hand, just in case.