Precision noise filtration. Hear what you want, not what you dont. Its all very well trying to block out all sound but sometimes you still need to be able to hear conversation, the cry of a baby, a car horn etc. Auritechs patented precision-tuned ceramic filtration means you can reduce the noises you dont want to hear, but keep those that you do. No muffling effect - no blocked ear feeling with Auritech products.