Behold the wonders of convergence: Your sunglasses are now your portable music player! The Oakley Split Thump ($250 and up) is an odd combo, but one that actually makes sense for a sunny afternoon jog or hike. Pro: The Split Thump improves on the previous generations of this device by making the earphones detachable and is more streamlined overall. The playback controls on the right stem (sorry, lefties) are intuitive. Con: An expensive merger: You can buy an MP3 player with more features and a pair of sunglasses separately for less.