Listen to music, take calls and track your fitness, without the inconvenience of removing your smartphone. The NEW advanced Lycra material has a waterproof coating, so it will block water from getting to your phone Run in the rain or sweat hard in the gym knowing your phone is protected. (Not for Submerging/Swimming) Whatever your arm size, the phone holder is secure and will not fall down during exercise. Train anytime, anywhere. The extra bright reflector strip gives you high visibility when running at night..syi