I explicitly bought these to use for running but I ditched them after using them for some months. They don't sit comfortably with any of the supplied plugs and when you sweat they start sliding of your ears. It's a pity as the sound was quite good. Have now bought a pair of Urban Ears which are much better fitting and which don't come of.
I owned a previous pair of Sennheiser running headphones which didn't last long (Sennheiser PMX 80 Sport II - Sport Line - headphones ( behind-the-neck )) and I was hesitant to get another pair of Sennheisers. I therefore bought a pair of Philips headphones with a similar system after having read positive reviews. Boy was I wrong. I don't know if I received a faulty pair but the sound was just plain awful. Returned these and got me these newer ones from Sennheiser. I must say I was pleasantly surprised when they arrived. They not only look better, but the build quality seems much better then the previous model. And the sound is… Read more