Thinking that these earplugs well respected the musical spectrum, I tried them for a festival! Alternating with conventional foam plugs (the known brand), we realize that these caps only protect Unless colleagues (attenuation of 20 to 35 decibels for Etymotic foam) !! In the end, only the highs are reduced and almost impossible to decipher the voice! It is set in 16 innovative product not at all! In addition, they are not comfortable!