User Review:

"I tested these out with my normal exercise/training routine and they stayed in place the entire time - through running, weightlifting, and even jumping rope (something previous earphones never seemed to be able to handle). The sound quality was more than adequate in my experience. Unless you're an audiophile you should be pleased with the audio quality on these, especially in terms of the price paid. They also do an excellent job of noise isolation, which I wasn't expecting - great if you have obnoxious neighbors or can't stand the music at the gym, perhaps not so great if you run/bike on streets and need to hear oncoming vehicles. I would go with an over-the-ear style headphone in that case."