Rab designed the Men's Xenair Alpine Jacket for instant warmth and temperature regulation during high-output mountain adventures like backcountry skiing, alpine climbing, and mountaineering. The Pertex Quantum Air outer fabric balances weather-resistance with breathability, while two densities of PrimaLoft synthetic insulation provide warmth where you need it and increase airflow everywhere else. Whether you're wearing the Xenair as outerwear or layered under a shell, you'll appreciate the range of motion from the articulated sleeves, and the laundry list of other alpine-specific features like a helmet-compatible hood, belay-friendly front zipper, and harness-compatible pockets ensure no-fuss comfort in the mountains.