Headband ear defenders These headband ear defenders from 3M have been designed to provide moderate to high levels of attenuation that meets the needs of an extensive range of industrial applications. Modern stylish design with super-slim line cup designed with liquid sealing rings and wide cushions help reduce pressure around the ears for supreme comfort for the user. With precise height adjustment that adapts to the size and shape of the head. These ear defenders conform to EN352-1 and have a single number rating of 27dB.