The firearms section of any sporting goods store will have a variety of ear plugs or protectors. I use ear muffs when running an engine on the ground or when operating power equipment around the home. The foamy ear plugs work reasonably well, though never as good as the muffs, of course. In the Air Force, there were conditions where we had to use double ear protection, plugs and muffs, and I complied. I still have very good hearing, though I have trouble hearing the wife, for some reason...
Bob in NEPA