I bought a Simpson Desert Devil https://www.simpsonraceproducts.com/products/simpson-desert-devil-racing-helmet helmet for the built in comms, it also has a cooling fixture.
It was a size too small and there wasn't really a good way to return it, they had to custom build it.
It's for sale here: https://pcasdr.org/show-ad/10735/new-helmet-for-sale/member-other/
If I don't get any takers, i'd like to donate it to the club for DE events.
It needs a couple adapters to connect to a chatterbox, they're around $80. If I end up donating it, it's no sweat to use my CC rewards to get the connectors.
Nice helmet, it came with an extra set of cheek pads.
It's brand new and has never been used.