The Patagonia Houdini Full-Zip Jacket is the ultralight windbreaker that disappears into a running vest or pack lid until the moment the wind turns on a ridge or summit. The PFAS-free DWR finish handles light moisture without the weight penalty of a laminate, so it moves freely between running, hiking, and climbing without asking us to carry more than we need. What Our Gearhead(R) Experts Are Saying:"I stuff this into my vest pocket at the trailhead and forget it's there until the ridge wind picks up. It's lightweight and adds virtually nothing to the carry but changes everything about the top of the climb."