Whether you’re topping out on the Fang or running dawn patrol on Dragon’s Tail Couloir, staying warm without overheating is critical. The Nano-Air® Light Hybrid Vest traps heat at your core—where you need it most—but lets off steam to keep you dry and comfortable. The front of the vest warms and protects with warm-when-wet FullRange® insulation (40-g) sandwiched between a plain-weave liner and a lightweight yet durable, weather-shedding 100% nylon ripstop shell with a DWR (durable water repellent) finish. The back of the vest features a superstretchy, airy waffle knit swiftly wicks moisture, controls odor and dissipates heat. The center-front zipper has a zipper garage for comfort on the chin, and zippered handwarmer pockets rest easily under a harness or pack. Stretch binding at the armholes and hem seal in warmth.