Always the ace up our sleeve, the ultralight, ultra-packable Patagonia Houdini Full-Zip Jacket is made with a lightweight recycled nylon ripstop that blocks the wind on summit trails and exposed rock faces. This jacket also weighs less than four ounces and packs down in an instant. The entire jacket stuffs into its own carabiner-loop chest pocket, letting us clip it onto a pack or harness when the wind dies down, or tuck it into a pocket of the smallest running pack. A DWR coating helps shed light rain when ever-changing mountain weather throws a curveball, and the one-pull adjustable hood tacks on protection from the elements.