It will stand up to mist or a light sprinkle but that's about it in my experience. The climashield insulation retains a very high insulation rate even when wet so it'll still be warm even when saturated. The insulation is very uniform and doesn't clump. The jacket is very warm, I've hiked in that and a merino T shirt in extremely cold weather. Definitely wouldn't recommend hiking with the jacket on though unless it's really cold and downhill.
