I use a small camera (Cisco Flip) to take video. It’s great for what I do, except small amounts of wind cause a lot of noise.
That’s where Micromuff helps. You have a small Velcro patch that glues to your camera, and a wind muff that attaches to the Velcro. I’ve been using MicroMuff Original for about six months, and it’s brilliant. I can hear people talking, not wind blowing.
I don’t think there’s anything similar, unless you’re going for professional external microphones and “proper” wind muffs. But even then this is handy because it makes syncing audio easier.