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The Quantum contains no fewer than three newfangled fabrics stitched together in a complex pattern. The result? A burly 23-ounce jacket that’s surprisingly warm and windproof for its weight. Unfortunately, it doesn’t breathe that well, and all that added stitching means more places for water to enter. Fleecy hand-warmer pockets and a hideable hood that stretches to fit a climbing lid are good news for skiers who want a jacket that works equally well on a headwall or a rock wall.