We asked our closest mountain guides what was missing in their climbing arsenal, and they talked of a dream layer that doesn't sacrifice durability for weight, with face coverage that pulls on in a flash to ward off unpredictable cold gusts on alpine routes. The result is the Glacial Trail—a truly functional layering piece. We thought out every last detail to ensure it layers without bulk, resists abrasions of all kinds, and protects as much of the face as possible without interrupting line of sight. It's a trail blazer's dream come true for everything from technical approaches to summiting 14ers.