What Our Gearhead® Experts Are Saying: "I rely on the Bergtagen as my base for everything from ski tours to alpine climbs. It’s soft, breathable, and regulates temperature better than any synthetic I’ve used."From high-output skin tracks to icy alpine ridgelines, the Fjallraven Bergtagen Merino 190 Long John offers a breathable foundation to our layering system. Part of the purpose-built Bergtagen collection, it’s crafted from 100% traceable merino wool for unmatched comfort and performance in cold, dynamic conditions. Lightweight and soft, this next-to-skin layer provides moisture-wicking warmth that doesn't overheat during sustained effort. The fine jersey knit construction makes this long john ideal for cold-weather mountain pursuits, while the natural odor resistance and high waistband ensure long-wearing comfort, even on extended expeditions. A gusseted crotch adds mobility where we need it most. Whether we’re climbing, touring, or transitioning between summit pushes, this merino base layer keeps us warm, dry, and focused.