I bought a pair of these based on your review (planet x/+red iridium) and took them mountain biking. I love em! I normally wear Jawbone or Flak 2, but these are much lighter and no frame obstruction whatsoever. And my post ride beer was as cold and fresh as when it left the tap... wait, that's my Yeti Rambler Bottle. Today was a good day for playing with new toys!