If you need hardworking synthetic insulation that you can stuff in a pack and wear anywhere, the Nebitron Pro is built to hold its own. Powered by new, high-lofting, synthetic PrimaLoft® Silver RISE insulation, it delivers instant warmth and burly protection, with greater resilience in cold, damp conditions. Offering mountain utility and climb-specific features, it’s geared up for winter hikes, mountaineering, and bitter belay ledges.