I keep one of these in my day pack all the time, as a 'just-in-case' jacket. I live in Utah so I'd only used it a handful of times in light showers, where it was fine. This summer I took it to Portland and got poured on while hiking a trail. It helped, but I still got soaked. Don't expect this thing to protect you from a downpour - it's more of a rain resistant light piece. Great for what it is, just don't but it as your only rain jacket.