The Men's Patagonia Houdini Jacket is an ultralight jacket for running and hiking at fast speeds. This shell is made of 100% recycled nylon ripstop, with a durable water repellent finish that will cut light winds and sprinkles of rain. It's not waterproof, but it protects against mild weather situations and even shields from the sun when moving fast. Getting warmer? It tucks into the left chest pocket for easy storage and can be clipped to a pack or shorts.