The SIE2I In Ear Headphones combine Bose's brilliant audio quality with water & sweat resistance making it perfect for any sport of exercise. It's integrated in line Mic. gives you convenient control over music or calls from your iPhone or iPod, meaning you can skip a track or answer a call with a single button. Bose exclusive Tri Port technology provides a wide range of sound, generating realistic bass & low tones & giving you the best possible quality during exercise.