helmet earmuff parts for radio kit.

I wanted to fit a baofeng two way radio kit into a Chinese fighter pilot helmet.
The helmet had soft earmuff which didn't seem very sound proof.
So I made these in TPU.
The open version has a pressfit plug/cap with a groove for the speaker wires.
I reused the original muff covers.
Hint - gopro sticky pads work well for the boom mic.
It is part of the paraglider project.
http://eddiem.com/fly