Designed to help protect the birds from your cat.
Birds are genetically predisposed to look for bright colours when looking for food and they will therefore see your cat moving much earlier and have time to move away rather than be ambushed. Also unlike a bell (which cat can learn to stop jingling) your cat can't work around having the Scrunchie.
Article about the research on its effectiveness here https://www.abc.net.au/news/2015-03-20/scrunchies-prevent-wildlife-death-study-finds/6337222
This Scrunchie is designed to have your cat's normal quick-release collar go through it to hold it in place and so that the quick release will still work.
Comes in two types:
LONG-HAIRED (which is slightly wider to be seen over all the fluff) please specify which one you need when ordering.
100% cotton and fully washable.