Can you have a breathable jacket that’s also 100% windproof? Colin Haley doesn’t have a graph on hand to show you why, but his short answer is “no.” Gearing up for technical pursuits requires trade-offs. Getting hyper specific about how your body runs, how much you’ll be exerting yourself and what the weather will be like is how you make those decisions. And even though you can’t have a 100% windproof and 100% breathable jacket (yet?), our experiments with waterproof/breathable shells are pretty