When the mountains demand both warmth and weather protection, Arc'teryx's Beta Down delivers as their warmest waterproof shell for serious alpine pursuits. This technical powerhouse combines 850 fill European goose down with GORE-TEX protection, creating the ultimate insulated hardshell for mountaineering, ski touring, and winter climbing adventures. The innovative Down Composite Mapping technology strategically places synthetic Coreloft insulation in moisture-prone areas while maximizing lightweight down elsewhere, ensuring you stay warm even when conditions turn wet. Built for alpinists who need harness-compatible design, the two-way front zipper and helmet-ready StormHood make this jacket essential gear for multi-pitch routes and backcountry objectives. Whether you're warming up in the hut after a big tour or pushing through storm conditions on exposed ridgelines, pit zippers provide crucial ventilation control while multiple insulated pockets keep your hands and gear protected from the elements.