I bought 3 ties. Came first and zipped up immediately. My son tried it on and we couldn't take it off. I sent it back and got a replacement. During this time a second tie came in the mail and appeared to work during the fitting. My son wore it for 2 hours, the zipper got stuck and we couldn't open it. Once again! i had to break Then a replacement tie came in the mail. The clasp is the same. 3 ties! The zipper design does not work properly. The zipper twists under the collar and then cannot be opened. You have to cut it or pull it forcefully, which will then permanently damage the flash. Manufacturers, you need to change that. This problem is well described in the reviews. Don't buy these ties
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