What Our Gearhead® Experts Are Saying:"This jacket is a perfect mix of warmth, breathability, and toughness. The Bavarian wool insulation keeps me warm even when conditions get damp, and the Dyneema reinforcement adds durability you don’t usually see in something this light. It packs so small that I never think twice about throwing it in my pack."The Trilogy Jorasses Wool Jacket was designed for demanding alpine pursuits where every gram and every detail matters. Millet built this technical midlayer with Bavarian wool insulation, which naturally regulates body temperature and continues to perform even when damp. Reinforced with Dyneema Ultralight fabric, it stands up to abrasion and resists tearing without adding unnecessary weight. Its minimalist design makes it easy to integrate into an alpine kit. The stretch hem sits comfortably under a harness, while raglan sleeves and stretch panels ensure mobility on steep ascents. The helmet-compatible hood adds vital wind protection, and the chest pocket keeps essentials secure and accessible. Highly compressible at just 319 grams, this wool-insulated jacket is part of Millet’s Trilogy Alpine Kit—a trusted system built for serious mountaineering, ski touring, and high-altitude expeditions where reliability is non-negotiable.