Take on tough training sessions with the JBL Endurance RUN 2 in-ear wireless sport headphones. Their FlipHook design and FlexSoft ear tips let you customize the fit, and their TwistLock technology keeps them in place all day. They have a waterproof design that handles tough workouts with ease and last for up to ten hours on one charge. | JBL Endurance RUN 2 In-Ear Wireless Sport Headphones - Black