Bilsom's Thunder T3 ear muff offers dielectric construction suitable for all workplaces, especially electrical environments. Uniform headband pressure for all head sizes, providing better comfort for long-term wear. Inner-ventilated headband minimizes pressure on the head, breathes easier in warm/humid conditions. Non-deforming outer headband withstands rough treatment in the toughest workplaces. Quick-Click height adjustment remains fixed during wear. Snap-in ear cushions make replacement quick and easy. NRR 30.