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Ear plugs - are placed into the ear canal so that they totally block the canal. They come in various pre-made shapes and sizes, or they can be custom-made by taking an impression of the ear. Ear plugs can reduce noise 15-30 dB depending on how they are made and fit.
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Ear muffs - fit completely over both ears. Again, they must fit tightly so that sound is blocked from entering the ears. Like earplugs, muffs can reduce noise 15-30 dB depending on how they are made and fit.
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Ear plugs and ear muffs - can be used together to achieve even greater sound reduction. Use of ear plugs and ear muffs is recommended when noise exposure is particularly high.
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