Designed for the fast-paced pursuits of ski mountaineering, the Ortovox Piz Boe Vest melds lightweight performance with walloping warmth, resulting in a versatile vest that's already a staple in our layering getup. The Piz Boe features a lightweight Pertex face fabric that's wind- and water-resistant for protection against light snow and brisk winds, while the merino wool inserts not only wick moisture and dry quickly, but are highly stretchy for unimpeded mobility in the mountains.