I'm a retired hearing aid engineer with a degree in electrical engineering and masters studies in audiology. I also became the companies expert on wind noise. That coupled with my companies expertise in hearing aids and ear plugs, I think I can comment.
The BEST hearing protection you can get are the old cheapy 'yello foamies.' Disregard the NRR rating on the package. These things are usually not installed properly so OSHA requires the 'NRR' which is the actual attenuation plus any degredation due to mis-installation. Properly installed, the actual attenuation is around 40dB. This attenuation is not limited by the ear plug, but by your mastoid bone. With a properly inserted yellow foamie,or similar plug) what you hear comes through your mastoid bone.
Fancy electronic plugs or muffs will NOT protect as well as properly inserted foamies. Muffs can and will leak and at best electronic plugs approach the foamies.
So, what is 'Properly Inserted?' Roll them up between thumb and fore finger to a small rod, insert quickly into ear canal and push it in as far as possible with your little finger and hold till the plug expands fully. Now, you should be scared you will not be able to get it out! But you can, even if you have to use needle nosed pliers! Actually, enough of the plug will ooze out that you will be able to pinch it between thumb and one of your fingers and pull it out. For sure, it isn't going to get lost in your ear! Your ear canal is an inch or more deep and the foamie is only 1/2 ' or so long. Ideally, you want to get the plug deep enough to get to the boney region of your ear canal. The outer half of the canal is the cartilagenous region and the inner half the boney region. Seal to the boney region and occlusion effect goes away. Occlusion effect is the talking in a 55 gallon drum sound with ear plugs in. This is usually a problem with electronic one-size-fits-most plugs and the molded-at-the gun-show plastic plugs. These plugs usually don't go far enough in for a good seal.
If you want good, custom plugs, go to a hearing aid dispenser and ask for a solid custom earplug with an impression past the second bend. They will know what that means. I know, this plug set may cost $50-$100, but you just spent $1200 for that new see-in-the-dark scope, isn't your hearing worth $100?[/QUOTE/]
Agree 100%!!!