High Quality: The sensor stickers made of cotton material sure that our patches stick and safe from water and sweat. which is soft, thin and; with it, you can stretch and move with your body for maximum comfort. Waterproof And Paste Firmly: This sensor covers patches is waterproof, breathable and non-slip , it allows your skin freely breath while protects. and also its reliable sticky ensures a very long time use. it can keep your sensor from being disturbed by sweat. No Hole & No Stick in The Center: Diameter 7.5 cm, This sensor covers are perfectly suitable for freestyle libre 2/3 sensors. without hole and glue in the center, It is not easy to fall off and no residue after each use. Easy to Use: The sensor stickers are easy to use, just easy to use these free sensor covers by yourself, no other help needed. and you can easily remove or replace the patch without pulling the sensor. Wildly Application: You will receive 40 pieces of overpatch to meet your needs in large numbers and different scenarios when you swimming, showering , exercising, sweating and other sports.