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Breath-freezing approaches and sunlit summits, spindrift runnels and corniced ridgelines—for every moment of an alpine mission, the Nano-Air® delivers a breakthrough in active insulation. Put it on and leave it on through high-output, stop-and-go cold-weather adventures—its stretchy and highly breathable fabric package integrates the qualities of fleece, soft shell and puffy by combining our warm-when-wet FullRange® insulation with a plain-weave liner and a lightweight, weather-shedding shell, which we’ve improved for durability. The incredibly soft, supple feel and full mechanical stretch allow for a close, updated, athletic fit over baselayers and an uninhibited range of motion. At brew stops or in frigid conditions, pull on a lightweight shell and the Nano-Air’s thermal properties skyrocket. The left-chest pocket and two above-harness handwarmer pockets all close with trim, low-bulk zippers. The center-front zipper has a storm flap and zipper garage, a dual-adjustable drawcord hem seals in warmth and the newly refined cuffs feature a sleek, low-bulk stretch-knit inset. The jacket has a DWR (durable water repellent) finish.