I usually wear shooting muffs good for 25-29db reduction. I figure the tractor is only 15-20db above a safe level anyway. I have no ears ringing after several hours of tractoring. The one time I did an hour of tractoring without hearing protection, I really regreted it.
Tip - hearing damage from loud noise is not instant, it's actually a matter of free radicals generated inside your ear and slowly killing nerve endings. You can slightly reduce hearing damage even within a couple hours after exposure by taking antioxidants. The military tested some recruits by giving them apple juice (yes, ordinary apple juice) after a shooting range session and found a small, but measurable, difference in hearing loss vs. a control group that didn't get the juice. Now this is NO substitute for proper protection, but I post it here for anyone to know in case they are accidentally exposed to loud noise but have a chance to get some antioxidants shortly after exposure. No, I'm not some crazy hippie who takes 50 kinds of supplements daily (I sometimes take a multivitamin - that's it).
I have been pretty good about protecting my hearing since late teen years, but had to work on my wife to get her to wear earmuffs for lawnmowing. I finally convinced her and am glad I did.
I watch for sales and recently got two pairs of Howard Leicht, made in Switzerland shooting muffs for $10 each from CDNN Sports. I think their NRR is 29 or 30db, among the best for muffs. There are earplugs that go up to about 33db that are easy to find and cheap. I don't buy earplugs unless they are rated at least 29db. My personal favorites are the green hexagonal "memory" foam ones sold at Home Depot, which I find more comfortable. I think their rating is 31 or 32db. Note that the db scale is logarithmic, so 33db is twice as effective as 30db, and 30db is ten times more effective than 20db.
mab said:
If I'm doing something particularly noisy, I will sometimes throw on a pair of Peltor P9's AND foam plugs. The plugs have a NRR of 22, which I figure cuts the top 22 dB off the long term ambient noise.
While using both plugs and muffs will give better protection than either one alone, just FYI it doesn't equal adding the two protection levels together. Another military study I read about found that the maximum possible hearing protection from using both was 36db noise reduction. This is because sound can also be transmitted through the rest of the skull, and apparently 36db is about what the skull attenuates. Your alternate option would be a spaceman helmet, I suppose. Word to the wise - .50 BMG and magnum calibers on rifles with muzzle brakes will generate higher noise levels than are safe even with 36db attenuation. Certainly wear both plugs and muffs if shooting any of that really loud stuff.