MSA Safety Helmet Helmet-Style Hearing Protection for Noise Prevention. The helmet-style hearing protection series is used in conjunction with MSA safety helmets and accessories, providing better comfort and fit while delivering the performance level and protective capability required for the job. Compared to helmet-style earmuffs on the market, it offers excellent attenuation performance; MSA provides customized sealing rings to achieve superior signal-to-noise ratio performance; it is installed and used with MSA safety helmets that have accessory slots; it works seamlessly with existing MSA goggles and frames, allowing for effortless integration into safety planning. MSA Safety Helmet Helmet-Style Hearing Protection for Noise Prevention. The helmet-style hearing protection series is used in conjunction with MSA safety helmets and accessories, providing better comfort and fit while delivering the performance level and protective capability required for the job. Compared to helmet-style earmuffs on the market, it offers excellent attenuation performance; MSA provides customized sealing rings to achieve superior signal-to-noise ratio performance; it is installed and used with MSA safety helmets that have accessory slots; it works seamlessly with existing MSA goggles and frames, allowing for effortless integration into safety planning.