Designed to fit around the back of the neck for use under welding helmets, sandblasting hoods, hard caps and fire helmets, this Muff is lightweight and comfortable. Features patented leak-proof, liquid/foam ear cushions that are easily replaced. The 5.3 oz. H6B/v not only protects the ears from noise, it also protects from welding spatter which can cause ear and ear canal burns. NRR 19.