EARMUFFS Klein Tools commitment to jobsite safety grows with the introduction of Hard Hat Earmuffs, specifically designed to fit Klein’s Full Brim Hard Hats, Cap Style Hard Hats and Safety Helmets. These earmuffs easily install via the universal side slots. Both models (Cat. No 60502 for Full Brim and 60532 for Cap Style and Safety Helmet) feature soft foam cushions for acoustic seal and all-day comfort. The Full Brim Hard Hat Earmuffs offer an NRR rating of 26 decibels.