3M™ PELTOR™ X4 Earmuffs are our lightweight and slim hearing protectors with innovative foam earcup inserts and spacers to help boost attenuation and protect against low frequencies. Available as headband, helmet attachment and neckband models. The headband model features an electrically insulated, twin headband that decreases heat build-up on top of the head. Depending on wearer preference or application need, the helmet attached versions are available as either dielectric electrically insulated or with robust metal arms.