Powered by Polartec® Alpha™ Direct—an ultralight, open-mesh fleece originally developed for the U.S. Special Forces—the ShadowFleece™ Quarter Zip is a new class of active insulation by Huckberry. Weighing in at 85gsm (half that of your standard T-Shirt), it offers an exceptional warmth-to-weight ratio, with a slightly sheer face that’s engineered to dump heat as you move and trap warmth the moment you stop. ShadowFleece™ is lighter and more breathable than wool, dries fast, and packs to a fist without wrinkling. The specialized fabric it’s made from earned the highest test results ever recorded by the Special Operations Forces evaluation team, outperforming every other insulation for breathability, durability, and quick-drying power. One layer effectively does the work of three, saving weight and simplifying your kit.