no. drytac gives 8000mm, 10000mm, or 15000mm waterproofing. a good 15k jacket will keep you dry for most mountain days, even through some rain but it's when you start sitting on a wet lift or wearing a pack that presses against your jacket, etc. that you will start to have problems with water intrusion. goretex and I believe eVent will keep you dry through just about anything. full on rain, sitting in a puddle, being sprayed with a hose, etc.