The Nano Air Vest by Patagonia is perfect for layering on chilly days in the mountains or just around town. Patagonia's exclusive fabric package is highly breathable and features a warm-when-wet FullRange insulation with a DWR (durable water repellent) finish to keep the moisture away. Overall the feel of the vest in soft with and athletic fit over baselayers and allows unlimited motion. The left-chest pocket and two handwarmer pockets all close with trim, low-bulk zippers. The center-front zipper has a storm flap and zipper garage, while stretch binding at the armholes and a dual-adjustable drawcord hem seal in warmth.