Features: Lightweight, comfortable helmet mounted earmuff that delivers a high attenuation level performance to address the most difficult noise situation. These mounted earmuffs can be used with a wide range of Proguard industrial safety helmet. Earmuff cups should snap in place during use & swing back when not in use. Can be perfectly fitted with safety helmet, helmet visor carrier BGVH with series FC 48 or Series SV-1 visors to provide complete head, face, and hearing protection. SNR: 27dB.