Next time you zip up, or zip down, check out your zipper. There’s a good chance it’ll say YKK. But, what is YKK? I head to South Gate, California, to find out. At Koos Manufacturing in South Gate, ...

I just received a leather motorcycle jacket that I bought online, and found that the zipper is installed European style, meaning when it's unzipped the zipper pull is on the left instead of the right.