CASHY6/V / HY6/V KIT HYGIENE W/1 PR FLUID-FOAM H6B/v Muff 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. In compliance with ANSI S3.19-1974 and CSA Z94.2-M1984 Class A. NRR 21. Made in USA.