The 3M H520P3E-410-GQ with Ear Defenders are a helmet-mounted hearing protection that combines comfort with an impressive 30dB attenuation level. The left and right ear cups link together with a soft, adjustable headband so that you can have a secure and comfortable fit no matter what type of helmet you wear. The 310 grams of weight are distributed evenly and the length of the foam seals provide a good seal for the best attenuation performance. The headband also features air-flow technology which keeps your head cool. The cup shells can be easily replaced to ensure a long product life.