Good for muffling, protecting ear drums, not clear sound
These definitely block some sounds.  I use them at the gym bc often the loud music gives me a headache.  When wearing these I can still hear the music and the beat and it does keep me revved up, however, hearing someone next to you talk is not easy.  The music is turned down in volume, but it muffles a lot and you cannot hear the music clearly.  I have not tried them at a concert but I'm certain they would protect your ears if you needed it.
Rating: 3 stars