When dark clouds are threatening to put a damper on your hiking plans, make sure you have the Sierra Designs Cagoule Rain Jacket. Its Hurricane Extender two-layer fabric wards off rain while providing breathability so you don't overheat while trekking, and the long length provides plenty of coverage. Plus, it packs down small and stows in its own zippered pocket for convenient storage in your pack when the sun pops back out.