The Max Protec from Walker's is a passive earmuff that features a super strong polymer vented adjustable headband and soft PVC ear pads. The sculpted cups do not interfere with helmets or hard hats. Additionally, this earmuff is dielectric i.e. it does not conduct electricity. FEATURES Super strong polymer vented headband Dielectric - Does not conduct electricity Adjustable headband Soft PVC Ear Pads Sculpted cups do not interfere with helmets or hard hats Mfg: Walkers Game Ear