Having trouble getting some shuteye at altitude? The Liberty 2 Pro earbuds ($130) will lull you to sleep and include a handy charging case so you get up to 32 hours of listening on a single charge. For superior sound, they support the aptX wireless format, and there's an app to tailor the music to match your personal hearing profile. Moreover, you don't have to be traveling to appreciate the Liberty 2 earphones. They pair just as easily to a TV, I've found, for private late-night listening and can endure a 5K daily run, no problem. And for making phone calls, the earbuds have 4 microphones with noise canceling to keep the voices audible.