Flexible two-way design allows you to wear the headphones either in-ear or behind-the-ear Headphones are lightweight and ergonomically built to ensure secure fit and stability no matter the workout Designed to endure and outlast your high intensity outdoor or indoor workout sessions in any weather conditions Bluetooth wireless allows you to stream high quality music without the worry of messy wires interfering with your workout In-line one button remote with microphone enables hands-free calling, allowing you to focus on your workout. A double press of the button activates Google Now or Siri