i have owned 3 pairs of these, i run and cycle lots, and there the only headphones which never fall out or off, but the cable always stopes working, it's to thin I think.... off to try these Sennheiser ones

The fit, the sound, the weight, the plastic vs. foam ear pieces made these by far the best headphones for running, inline skating, etc. But successive two pairs in a row died in one ear after a few months of use. I couldn't shell out $30us for a third pair that will do the same.