I remember so long ago football coaches using 2 way radio head sets with a big Motorola "M" positioned prominently. For quite a while now Bose has been the supplier of these. I found an interesting article about the design research & manufacturing of this gear. They aren't electrostatic cans, for sure! And that Bose is just a link in the chain of communications:
https://www.pcmag.com/news/why-nfl-coaches-rely-on-bose-headsets-to-strategize-the-super-bowl
https://www.pcmag.com/news/why-nfl-coaches-rely-on-bose-headsets-to-strategize-the-super-bowl