The Patagonia Men's Nano Air Jacket delivers a breakthrough in active insulation. Put it on and leave it on through high-output, stop-and-go alpine missions ? its exclusive, stretchy and highly breathable fabric package integrates the qualities of fleece, soft shell and puffy by combining a plain-weave liner, warm-when-wet FullRange? insulation, and a lightweight-yet-durable, weather-shedding shell with DWR (durable water repellent) finish. The jacket?s incredibly soft, supple feel and full mechanical stretch allows for a close, 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, while stretch binding at the cuffs and a dual-adjustable drawcord hem seal in warmth.

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