Elvex Impulse foldable ear muff is equipped with noise suppression and communications circuitry. Users get impulse noise suppression, while the electronic circuitry enhances weak sounds, such as an instructor’s voice. An impulse filter activates in four milliseconds. Sounds exceeding 82dB are suppressed by a gain limiter. The Impulse provides 25dB NRR. Elvex Corp., Bethel, CT. www.elvex.com