Rudolph "Electronic" Ear Protection offers premium sound quality for the greatest experience while protecting your ears from damaging loud noise. We use feather weight polymer plastic for a light weight fit and rugged durability. The soft padded ear cups are a must for comfort. This Electronic ear protection automatically shuts out sounds over 85dB. With a 25dB NRR rating and 8X amplification these sturdy, compact and collapsible muffs will be light weight for all day use.