Our helmet covers are like your friend who doesn't like big storms but is always there for the little showers. They are water-repellent, which means they can repel water during light rain, keeping you dry and stylish for most of your adventures. However, in the case of a flood comparable to that of a dramatic movie scene, they are not completely impervious. Think of them as your shield against small showers, but for big storms, even HELMUT recommends seeking shelter and enjoying Mother Nature's show from a dry location.