Designed specifically for the fast-paced pursuits of ski mountaineering and backcountry touring, the Ortovox Swisswool Piz Boe Vest melds lightweight performance with walloping warmth, resulting in a versatile vest that 's bound to become a staple in your layering getup. The Piz Boe features a lightweight Pertex Quantum exterior that's windproof and water resistant for protection against light precipitation and whipping alpine winds. Its Swisswool insulation provides lofted, woolen warmth that easily regulates your body temperature with merino wool inserts that not only wick away moisture and dry quickly but are highly stretchy for unimpeded mobility