Well, I wear several different jackets made of the same fabric, and have done for several years. I have never got wet. I think the term you are looking for is impermeable, which it isn't, nor is it supposed to be. I wear one of my jackets for cycling. It was marketed as a cycling jacket. I am always dry after my ride. The design and construction of my other jackets (and gaiters) are such that I stay dry from rain, and do not build up levels of sweat or vapour inside my clothing. I find them comfortable and quiet.