Comfortable Safe Materials-Made of natural cotton fabric.Light weight,latex-free,hypoallergenic,breathable,stretchable,safe and comfortable for your skin.In addition,practically pain-free removal and no adhesive residue on your skin. Waterproof - Sweatproof-Fast drying,it is waterproof and sweatproof.Only simply apply our adhesive patches,you will have no worry on shower,running,fitness exercise,etc.This small things will make you stay active in all weather conditions and bring you a better life. Easy To Use-No glue in the center,it will not stick onto your device and lead to any damage on your sensor.Only easily tear off the pre-cut backing paper and apply to your device,then it will firmly stay on your skin and provide continuous protection for your sensor.