Having gone to hundreds of gigs I started to notice that the buzzing, hissing noise was not going away completely. Real Tinnitus is a horrible, sometimes debilitating condition and I have no intention of developing it. I tried several different types of plugs from tissue paper (desperation at a particularly loud gig), through the foam types and waxy cotton wool. All worked but really affected the quality of listening.
Then I discovered these. Having a flatter frequency response it's more like the entire volume has been turned down. Another benefit I have found is that you suddenly get decent separation of the various instruments and vocals - you can hear the words!
They are relatively comfortable, easy to insert, especially if moistened, and come with a linking cord and handy pouch.