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When our fast-moving, high-output alpine adventures go from cold to hot in a flash, we're glad we layered with the Rab Mythic Alpine Light Jacket. This insulated style redefines lightweight with a clever combination of 900-fill down and PrimaLoft Gold Active insulations, stitch-through constructed to cut down on weight and improve climbing, hiking, and touring mobility. Pertex Quantum ripstop offers weather protection at a barely-there weight. When we pick up the pace and no longer need the extra layer, the Mythic Alpine Light packs down tight to save room in our packs.