These Bluetooth headphones have been specifically developed for serious athletes. They offer cord-free convenience and are designed with designed with tangle-free grooved cable with cable adjuster. Designed with Air Cushion Support Structure for a secure and comfortable fit. The stable fitting allows you to listen in comfort while exercising without having to worry about them falling out. Included open type ear pieces allow you to hear ambient noise when outdoors for added safety. A sweat and rain proof design (IPX4) insures dependable operation.