I tried it by blowing into the microphone as hard as I could from all sides. It works really well, I didn't expect it! Absolutely nothing compared to the original foam windscreen that comes with the Rode Video Mic Go II microphone. That one is not suitable for recordings in windy environments, so get this furry windscreen with your eyes closed.
Update: I also tried it with regular, quite strong wind in an outdoor environment. Perfect result, nothing compared to the simple sponge that microphones have on their own. I highly recommend it!!!