3M Combat Arms Reactive Earplugs
Hear-through protection. These ear plugs feature a special acoustical filter that lets lower level sound through with relatively little noise reduction for greater situational awareness, and yet they provide increasing amount of noise reduction as sound levels increase above 110dB. Open or close the small filter switch to choose between modes. In the "shut" mode they act like normal plug type ear defenders.
Medium and Large sizes available. Most people will fit the medium, if you have larger ears then its best to go for the large.
*NOTE - plugs must be pushed in fully to work*