In noisy situationsdoing yard work with power tools or maybe dinner with the extended familyit's worth using noise-cancellation headphones, which emit energy in a frequency that we can't hear. The sound waves they create have the same amplitude but opposite polarity as the original sound; they combine with the external wave and effectively cancel it out so there's no sound at all.
Models available in stores typically cancel lower-frequency noises, while the ear cups themselves protect you from high-frequency noises. (By the way, there's no evidence to suggest that these devices cause any damage of their own.) If you are exposed to loud noises that come and gosirens, trucks, trafficcover your ears. And bring earplugs to weddings and bar mitzvahs.
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