Not only YKK, but other brands of waterproof zippers can be really waterproof? The individual thinks the answer is no, in the case of long time of rain, waterproof zipper is not to reach the requirement of complete waterproof, or the waterproof effect that can not reach the fabric of the suit. In other words, if there is no cover for the waterproof zippers, this charge will not be completely waterproof. When the rain passes through the pockets, the whole fabric is still wet! I didn't test every brand, and maybe the test was unscientific. But as long as the test is not waterproof. I didn't ask for the meaning of some high-end brands, but I wanted to really understand the features of waterproof zippers. Which big brother more understand the trouble to inform, also want to understand the test waterproof zipper to compare the scientific method, the younger brother in this first thanked the security that rely on.