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Like other hybrids, the Black Crows Hybrid Alpha Jacket mixes and matches materials to solve our biggest layering conundrum on the trail or mountain--how to stay warm enough without getting too hot and sweaty when we crank up our intensity in cold conditions. This jacket threads that needle with its Pertex Quantum Air shell--which is not only breathable, but also air permeable--and its body-mapped insulation. The front and shoulders feature warm yet breathable Polartec Alpha insulation while the sides and back feature a lighter stretch-mesh blend that maximizes breathability and manages moisture to keep us drier and more comfortable when we're huffing and puffing our way up the skin or sending it. This gives us the technical performance we crave for our high-output winter pursuits.