So I have a bunch of questions about hearing protection... If you have any insight, details, or links to good information for any/all of this or questions of your own, please provide them! Without getting too sciency, can anyone explain NRR in layman's terms? Are NRR values linear? Meaning that an NRR of 26 is 1/25th greater than an NRR of 25. Or is it like the Ricter scale where larger numbers are exponentially larger? How much protection do you get from using both ear plugs and ear muffs? I know that it's not an aggregate value (33NRR plugs plus 25NRR muffs does not equal an NRR of 58). I know that there's a "formula"/rule of thumb for it, but don't remember what it is. How does NRR actually relate to gunfire? I believe NRR is generally designed around continuous noise and not peak noise. Are the molded earplugs better than the disposable ones? (Assume proper molding and proper disposable ear plug placement.) Can you simply add more/better foam to your muffs and get better ear protection? Why does 33NRR seem to be the highest rating? Now, my personal situation. I wear Howard Leight - Super Leight(R) Shooter's Earplugs (33NRR) and Howard Leight - Leightning(R) L1 Shooter's Premium Earmuffs (25NRR). I know that I can buy 30-33NRR earmuffs. What value would there be to getting the 33NRRs to wear over my 33NRR earplugs, if any? (Other than the overly simplistic - even though it might be right - more = better. I'd like something more "quantifiable". Thanks!