It's Waterproof - It's proven to be waterproof, so you don't need to worry about showering, raining, swimming, etc. (without sensor) 14 DAYS LONG-WEAR PROTECTION - Its reliable stick guarantees long lasting 14 days. The adhesive is hypoallergenic and latex-free, leaving no residue on the skin even after 14 days. Non-stick center: it won't stick to your sensor, but protect it around in case you need to replace the patch, it won't cause damage to the sensor. NATURAL COTTON MATERIAL: This large size (3.15" diameter) free sensor patch is made of natural cotton material which is breathable, stretchy and flexible. EASY TO USE AND EASY TO READ: 3-part pre-cut paper, easy to use by yourself, without the help of others. Also, you can easily read from tape as usual. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store