I love these bone conduction Aeropex headphones because you can hear what you are listening to yet you're still able to hear what's going on around you. 

These might not be the best headphones out there, but they suit my needs. 

I purchased one almost two years back, and I had been using them almost every day. One day, the right side starting becoming loose and the sound had unbearable. Luckily, it was still under warranty and the company sent me a replacement.