After two years on the market, the Nano-Air continues to be one of our favorite jackets for alpine climbing, cold weather running, and ski touring. No other jacket feels as soft and comfortable against our skin or offers as much stretch and mobility. We wore it around the house on chilly mornings, and even to sleep. Our Top Pick for Breathability, the Nano-Air is lighter and breathes better than its closest competitor, the Outdoor Research Uberlayer, though it's less burly and has less features. It has two super convenient chest pockets, two hand pockets, and a hood that fits well, even without a cinch cord. While most of the synthetic jackets in our review are alternatives to down jackets, the Nano-Air offers a warmer, weather resistant alternative to a fleece.
The Nano-Air has been tweaked just a touch since we tested it. See the latest version pictured above and check out the scoop on what's different below!