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Weather can change in the blink of an eye, so we throw the Black Diamond Fineline Stretch Shell into our pack for versatile protection in a pinch. This lightweight shell is made with Black Diamond's BD. Dry 2. 5-layer construction for waterproof, breathable protection on trail runs and day hikes alike, while the stretchy fabric and underarm gussets provide the free-ranging mobility needed to bag peaks. And weighing just under ten ounces, this jacket can be stowed in its own chest pocket and neatly packed away when the sun comes out.