I have read some reviews that say they are not waterproof. I don't recall reading anything in the description that said they were waterproof, but water doesn't stay under them. It is a woven and breathable material so water gets in and also drains normally like a bandage. I've been using them for almost a year now after trying another brand or two. They are great and highly recommended by the CGM user community. The adhesive is very strong and I also use Skin Tac to keep it on the sensor for the full 10 days. I still clean it after 10 days but again with Skin Tac wipes. I highly recommend this patch!
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