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 (2.95" diameter) free sensor patch is made of natural cotton material which is breathable, stretchy and flexible.EASY TO USE : Easy to use by yourself, without the help of others.