Tired of being bound by motion inhibiting down coats, Patagonia developed the Men's Nano Air Insulated Jacket. A nylon ripstop fabric with mechanical stretch, coupled with Patagonia's own FullRange synthetic stretch insulation, offers full range of motion. With a slim fit, it will layer nicely under your shell, and won't cause any uncomfortable bunching. An added DWR finish applied to both the shell and lining will repel moisture, so you won't have to worry about moisture creeping into the insulation. Great for high alpine ascents, multi pitch climbing, or long days on belay the nano air will keep you insulated and warm, without holding you back from making that last move.