WLS1011142 / 1011142 CLARITY MUFF CLARITY C1 NRR 20 Clarity™ Muff Clarity™ noise filtering technology screens out harmful noise while allowing the human voice, warning sounds and alarms to be heard. This patented technology offers sophisticated filtering without electronics, improving safety in environments where overprotection is a danger. Robust construction of the non-deforming outer headband withstands rough treatment in the toughest environments. The inner ventilated headband minimizes pressure on the head, working with broad ear cushions and spacious earcups for all-day comfort without compromising attenuation. Quick-Click height adjustment keeps the wearer's setting fixed during wear. Dielectric design is suitable for all workplaces, including electrical environments. Meets ANSI S.319-1979 and CSA Z94.2-M1984 Standards.