Whether we're chasing powder, snagging summits, or running ridgelines, the Patagonia Nano-Air Light Vest stops icy temps from numbing our core. We move freely and our microclimate breathes easy under the stretchy and airy material and insulation. The handwarmer pockets can still warm our fingers with a harness on, while the low-profile armholes and hem slide discreetly under a shell.