I wear Norths ( Lee Sonics)when I am upload hunting, they have been around for many years .
They are plugs with a shut off system in them .
The original ones available to civics were built using an aluminum body, but the newer ones are made with a plastic body .
They work great , and you can hear very we with them
I eas wearing Walkers fir a while when big game hunting but normally do not wear them.
Cat
I remember them being used by duck hunters, I mean they told me about them but I was too young and poor to afford such class. Plugs normally don't fit to well into my earholes but I'll check them out if only for info purposes.