Hellberg® Secure S1C Green Helmet Mount Earmuffs (SLC80 25dB, Class 4) Black thunder would be a low

thunder would be a low frequency sound and a bird tweet would be a high frequency sound

while still allowing you to hear voices clearly -- without that "muffled" feeling you can get from traditional foam ear plugs (which provide much more sound blocking)

Alpine MusicSafe Pro earplugs come with a handy case in which to store the earplugs and filters

Radiant orange color for easy compliance checks

Longer length for easy fitting and removal

Hellberg® Secure S1C Green Helmet Mount Earmuffs (SLC80 25dB, Class 4) Black thunder would be a lowProtection level 1 for low to medium noise Very slim and light weight Approved with most popular safety helmets The helmet mounted earmuff is the ideal choice for any work that requires head and hearing protection. Its durable construction withstands rough environments and the slim design reduces the risk of snagging in branches or confined areas. Protection level 1 is suitable for low to medium noise levels, between 75 90 dB. A perfect choice for