Chosen Solution

i have worn through the collar on my Patagonia lightweight vest from normal wear. the collar has frayed along the back of the neck for maybe 8 inches or so. i am going to start losing the white insulation inside if i don’t fix it . the rest of the vest is in great form. i have had this vest twelve to fifteen years. i wear it all the time. thank you

I’d use a long piece of tenacious tape. Here’s a video on doing that: https://www.patagonia.com/repairs/#video