[frambooz]

Originally Posted by Fredrik

I got curious and found these as well which seems to be what you are looking for.

Ear monitors, plugs and hearing protectors - Sensaphonics

Their contact form has these two check marks at the bottom that gave me a chuckle:

[ ] Please add me to your email list for company news.
[ ] Yes, seriously, add me to the mailing list.

(I didn't check any of them. No, seriously.)