Easy to Use & Easy to Read: 3 Part Pre-cut back paper, easy to use by yourself, no need other's help. Also, you can easily get a reading through the tape as normal. Natural Cotton Material: This large size(3.15 inch diameter) libre sensor patch is made of natural cotton material, it is skin breatheable, stretchable and flexible. No Stick on the center: It won't stick onto your sensor but protect around it , in case you need to change the patch, it brings no damage to the sensor. 14 Days Long Stay Protection - Its reliable stick ensures a long stay of 14 days. The adhesive is hypoallergenic and Latex-Free, leaves no residue on skin after even 14 days. It's Waterproof - It has been proven to be waterproof, therefore, you dont need to worry about shower, rain, swimming etc.