Everything is as strong as its weakest link. This applies to many things, and it also applies in the case of motorcycle clothing.
The zipper is usually that weakest link. Motorcyclists wearing gloves who want to open or close a zipper while riding are not the best friends of the zipper, and nothing is as annoying as a defective or broken zipper.
Because there's a lot more to your boots, gloves, pants and jackets than just a zip puller, we at RAD think it's a shame you'll have to consign your riding gear to the bin just because of it.