Relays Sport WirelessDesigned for comfort, engineered for soundNo pain, no gain? Not with your headphones. Relays Sport Wireless revolutionary fit with FreeFlex Technology is effortless to use without complicated twisting locks and hooks that irritate your ear over time. And with its noise isolating in-ear tips, you'll hear the full sound and emotion of your music that will help you run faster and train harder. You'll love them more than your favorite pair of shoes.This is one of the most advanced Bluetooth sports headphones with up to 8 hours of playtime, full range high fidelity sound, quick charge technology, microphone, music controls, sweat and water resistance, and a special outdoor sound mode.No pain, no gain? Not with your headphones. Relays Sport Wireless revolutionary fit with FreeFlex Technology is effortless to use without complicated twisting locks and hooks that irritate your ear over time. And with its noise isolating in-ear tips, you'll hear the full sound and emotion of your music that will help you run faster and train harder. You'll love them more than your favorite pair of shoes. This is one of the most advanced Bluetooth sports headphones with up to 8 hours of playtime, full range high fidelity sound, quick charge technology, microphone, music controls, sweat and water resistance, and a special outdoor sound mode.PREMIUM SOUND: These noise cancelling earbuds deliver a rich and full sound that brings you straight to the source. You'll hear deep bass and amazing clarity. The outdoor sound mode increases the bass when running outdoors.FEATURES: These earphones have an integrated microphone and Siri control with a multi-function button that activates Siri, allowing you to control your music and answer calls. You never have to reach for your phone during your workout.AUTHENTIC DESIGN: The free flex secure fit, ultra light earbud design adapts to most ear sizes without the need for complicated parts or ear hooks which hurt over time. Choose between four ear tip sizes for the best fit.RECHARGEABLE & COMPATIBLE: These are one of the most advanced Bluetooth sports headphones with up to 8 hours of playtime for a week of workouts, or a full day of listening.SOL REPUBLIC: Sol Republic are music lovers who are committed to changing the world one listener at a time. They are Saviors of Sound ready to rid the world of hollow sounding headphones and speakers.