Howard Leight Viking V3 Multi Position Noise Blocking Earmuffs with 29 dB NRR have non-deforming dielectric construction and patented airflow Control? technology that ensures superior attenuation across all frequencies. Earmuffs can be worn over-the-head, behind-the-head or under-the-chin and is used when using other PPE like hard hats, visors, face shields, respirators and welding shields. They protect workers in electrical environments and resists use and abuse. Earmuffs have headBand with a ventilated inner construction and minimizes pressure on the head while allowing for easy breathing in warm/humid climates. They feature snap-in ear cushions that make replacement fast and convenient and an elastic headBand strap for better positioning.