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The Rab Men's Positron Down Jacket is a force field against freezing days. With 10 ounces of 800-fill Nikwax hydrophobic goose down and water-resistant Pertex Quantum Pro face fabric, this strong winter jacket is perfect for high-altitude adventures. Sewn together with durable nylon lining and stitch-through sides and arms, the Positron is flexible and breathable for a comfortable fit on the groomers or in the backcountry.