Dielectric: Ensuring optimum security, the dielectric insulation protects users from electric shocks and shorts; Our multi-functional design fully encompasses the ear for maximum insulation, while automatically blocking hazardous sound levels. Over-the-Head Ear Muffs, 25 dB, H225, Blue Today, we are synonymous with the best in head, eye, face, hearing, knee and welding protective products that deliver safety, productivity, comfort and peace of mind. Adjustable: Featuring soft, attractive blue cups that are ideal for extended use, they grant constant support to your head & ears, providing a personalized fit; The tough, long lasting tension bands are easily adjustable for quick & convenient positioning.