Works very well!
I bought these to go to a concert in large arena where the acoustics will ruin your hearing. I was nervous that I would look stupid, but they are very well concealed. You simply cannot tell they are in your ears. Additionally, I could still hear the music and converse with people. It blocked things just enough where I wasn't in major pain after the show. I highly, highly, HIGHLY recommend.
Rating: 5 stars