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Protect your hearing without interfering with your ability to hear routine sounds and conversation. Safe sound levels are allowed to pass through, while potentially harmful noises (above 80db) are reduced via a proprietary design that incorporates the patented Hocks Noise Brakerfilter. For correct sizing measure distance from the top to the bottom of your ear's helix bowl. 7/8th inch = small; 1 inch = medium; 1 1/8th inch = large.