This product is not waterproof. It is used by everyone as a panty liner. The number of repeat customers is increasing. Both sides are made of double gauze, with a 100% fabric layer in the middle, making it a three-layer construction. It can be washed and used repeatedly. It should fit comfortably in your underwear without any discomfort. We hope you enjoy it as a reversible product. Size: Length 17 cm, Width 7 cm Thank you for viewing.