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The Castelli Fly Direct Jacket is our go-to for colder days, where more warmth than a vest or light jacket is necessary. The windproof microfiber woven outer shell, which features DWR treatment for added water repellency, helps keep us warm by blocking the wind, while the Polartec Alpha Direct insulation provides maximum loft and insulation without added weight. And with three rear pockets, we won't have to worry about digging underneath our jacket for essentials in our jersey pocket.