The Men's Patagonia Nano-Air Light Jacket is a light insulator for fast-paced mountain adventures. Hike, climb, start, and stop; this layer can keep up with it all by releasing body heat and offering light warmth against the cold. It stretches so you won't be restricted and the cuffs can be pushed up the forearms or lay smoothly under a shell. All three pockets close with a zip for small item security, and the jacket tucks away into the left-chest pocket for easy stashing in a pack.