Low-frequency noise; the best choice when nothing else will do. 140-150 dB levels. Using passive noise-blocking muffs attenuate based on the highest quality of insulating and dampening materials. Light, durable construction with easy size adjustment provides the perfect fit for all head sizes. Are dielectric, non-conductive. Wide and soft ear cushions with snap-in system for quick, easy replacement. Smooth telescopic single point adjustment increases comfort, stability and wear time.