Designed specifically for the fast-paced pursuits of ski mountaineering, the Ortovox Men's 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 exterior that's wind and water resistant for protection against light precipitation and brisk winds, while the merino wool inserts not only wick away moisture and dry quickly, but are highly stretchy for unimpeded mobility. Additionally, the Swisswool insulation provides lofted, woolen warmth that easily regulates your body temperature, and the snug-fitting hood fits under or atop a helmet. Not to mention, the bevy of pockets are harness and pack friendly, and the slim fit of the Piz Boe enables you to layer atop it without compromising your mobility in exchange for being as warm as a blue whale.