A narrow margin separates bluebird days and afternoon thunderstorms when you’re in the mountains. Here to strike that perfect protective balance, the Black Diamond Men’s FineLine Stretch Rain Shell acts as a lightweight, waterproof, breathable, and windproof shield against the elements for your alpine adventures, from rainy trail runs to escaping freshly-bagged peaks as torrential storms roll in. A 2. 5-layer BD. dry construction keeps rain, sleet, snow, and wind at bay, while allowing internal moisture to escape easily, as the four-way stretch face fabric enables a full range of motion for levels of comfort not usually found in rain shells. Gusseted panels in the underarm areas further open up your mobility. The adjustable, climbing-helmet-compatible hood ensures that safety isn’t compromised, and a zippered chest pocket stows the entire jacket for easy packing.