Rare is the winter layer that’s both warm and appropriate—with freedom of movement and breathability—for aerobic activities. It’s old hat that you’ll have to constantly add and subtract layers as you cycle through a day of backcountry skiing or ice climbing. Enter Patagonia’s Nano-Air, the Stretch Armstrong of synthetic jackets that’s filled with a new, elastic DWR-treated polyester insulation (called “FullRange”) that gives it unrivaled mobility among jackets of its weight. If the claims are true, this stay-on-all-day jacket should lighten your winter load considerably.
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