I'm not sure how you could use it for that. Well, you could put a couple of those things over your ears, but earmuffs already exist. More likely it would be use

I'm not sure how you could use it for that. Well, you could put a couple of those things over your ears, but earmuffs already exist. More likely it would be useful for building better mufflers onto noisy equipment. A muffler on musical instruments? I could imagine it fitted to a trumpet perhaps.