Waterproof Sensor Adhesive Patches for Freestyle Libre Series - Sensor Protective Film 7.5cm in Dia Waterproof & Sweatproof:Sensor covers are waterproof and sweatproof,so you don't have to worry about it peeling off while swimming or exercising. Strong Adhesion:High-quality materials make the patch more adhesive,it can be used to adhere for 15 days.No residue when peeled off. No glue in the center:This Libre 3 sensor covers with no hole & no glue on the center design, which make s it easy to replace the patch easier, and not affect your sensor use. Transparent and :This waterproof libre sensor covers boast a thinner,and the upgraded adhesive layer ensures the patches blend seamlessly with your skin,staying while maintaining superior durability. 15 Days Long Lasting:High-quality latex-free material makes the patches long-lasting and ,whether in sports,bathing or swimming, they can maintain strong adhesion for a long time,and lasting more than 15 days Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.