Sennheiser PMX 70 Sport

Pros: I usually am on the cardio machines in the gym, or running outside- ear buds have never been a good fit since they pop-out once I start sweating. These headphones are secure, comfortable and lightweight.

Cons: Unfortunately I've gone through 3 paris of these- same problem every time- the right ear goes silent- not sure if this is due to sweat or if the connections to the speaker are poor.

Summary: If you work out hard and sweat a lot- especially if you focus most of your workout on the cardio-side, these are an excellent choice. Ear buds never stayed-put...but these fit securely and comfortably. Beware though as I have never had a pair that lasted more then 6 months. Sennheiser should fix this issue!