I use a full face helmet that I've attached a motorcycle comms system to. The system has a microphone on it and it connects to my phone via bluetooth. I use voice notes on my phone to record audio(you can see me fiddling around on my phone to get it started at the start of the video, and attempting to stop it at the end) which captures audio from the microphone in the helmet.

I'm really surprised by the lack of wind noise too and its AWESOME. I take calls while riding around and nobody can tell that I'm doing so. Whatever Cardo did to get it working like that, they did it real well. If I wanted to set this up on my brain bucket, they gave a boom mike attachment with a stiff holder so I could add it to that too.