The next time you are in a call in a noisy environment like a driving car, check out the control center on your iPhone. When your microphone is open, you will find a new control: Mic Mode. This lets you select the plain old Standard Mode, Voice Isolation or Wide Spectrum.
This is a recording in Skype with Standard. You will hear some music playing in the background:
And this is a recording in Voice Isolation, where the music is almost completely gone. You only hear it for a split second when I start or stop talking:
As you can hear, this setting makes AirPods much better for voice calls. Recommended!