This is a good site. ((( Smiles )))

Being a former mack gal myself and a muff and a bose gal as well..
Though I no longer use theses products like I use too.
I mostly use my fingers and muffs but very rarely like with
the vacuum.
But after getting a more quiet vacuum and with my hyperacusis improveing more as ..
I'm like cured now.
I don't use the muff's with the vacuum anymore..

http://www.macksearplugs.com

8. Are there any earplugs on the market that block out 100% of the noise?

The highest noise reduction rating (NRR) currently offered by an earplug is around 33 decibels.
If you refer to figure 1 in question #7, you will find that decibel levels up to the earplug's NRR rating
(in this case 30 dB, which is typical of soft music), will be blocked out entirely.
Any noise over the earplug's NRR may be heard.
Another important factor to note is that the body absorbs sound;
so short of encapsulating oneself in a sound proof chamber,
it is seemingly impossible to block out all noise.
Earplugs and other types of hearing protection devices are designed to take off the harshness of the noise..
and bring it down to a safer, more tolerable level.