One of the most important, but often overlooked, features of our parkas, coats and other garments is the zipper. Where applicable, we use a #10 YKK molded tooth zipper. If your zipper fails to work when you are out in the field, it is irrelevant how good the rest of your garment is. I have been using the YKK #10 tooth zipper for 20 years, and I have yet to have a product returned due to zipper failure. We also manufacture snowsuits and parkas used throughout the state of Alaska. The only zipper I will use for these garments is the #10 because it has proved to work at -100 degrees F.