Designed to help protect the birds from your cat.
Birds are genetically predisposed to look for bright colours and they will therefore see you 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 collar.
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 that fluff) please specify which one you need when ordering.
100% cotton and fully washable