Cheap electronic earmuffs are frequently unsatisfactory because the rated NRR does not tell the whole story.
The electronics need to shut down FAST or they still hurt your ears. Cheap muffs are cheaply made.

If you have the money, just buy the Pro Ears and enjoy the comfort. As a CRO and match director, I spend a lot of time on the range and am glad I spent the money for the best.

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Science plus Art