I can share my personal experience with you. I am a avid runner and had tried many earphones for running and was always on the lookout for the following from an "ideal" earphone (in order of priority):
- Comfort & does not fall off easily
- Lightweight (that leaves headphone out)
- Good sound sealing
- Good sound quality
I tried bluetooth earphone, earbuds from apple etc and found the Shure SE215 to be able to meet my requirement. The price range is around low $200. What I like best was the tight fit over-the-ear wearing of the earbuds which sit tightly into my ear. The sound isolation was good and the bass is strong and the sound quality is reasonable. You can change the cable if worn out and your investment is still protected because the earbuds are not attached to the cable permanently. Google it more to learn more.