Perfect In conjunction to adjustable positioning and comfortable cuff pads suitable for extended use, ergonomically designed, EVA foam headband allows for a personalized fit that holds securely in place without slipping, to ensure maximum safety. Our ear muffs passively isolate noise, don’t require batteries and feature strong stainless steel wire swivel fork arms to ensure strength & long-lasting durability; In addition, the cap mounted design easily fits over hard hats & other headgear. Ear muffs can be the most effective equipment to protect your hearing from construction work, ground support, wood work etc.; Create a silent world around you with one of the highest noise reduction ratings for a cap mounted muff of 28db. Ideal for professional use, it is practical for shooting, hunting, sports events, study, steel & hardware work, manufacturing, oil drilling etc.; Independently tested and certified to NRR 28 (ANSI S3.19) and CSA Class A. Designed to mount on to most brands of slotted hard hats, pair our Cap Mounted Safety Ear Muffs with Sellstrom’s 4-point Ratchet Suspension Full Brim Hard Hat to ensure maximum safety in head protection and sound exposure.