
Wind noise. It is also sometimes used as a clown nose and is excellent for both purposes. I've had them for many years and I have to say I'm impressed that the foam is still in great shape and not falling apart. It does really well in the wind as a pro tool, but there are others that cost three to five times the price if you really need that level of wind protection. I've found that most people don't, and who wants to use those really, really expensive noses as clown noses?