Safree is a sanitary napkin designed for visually impaired women, aiming to simplify the procedures of changing sanitary napkins and solve the delayed proception of menstrual blood leakage. The whole product is in the form of a belt attached to the sanitary napkin, which simplifies the steps of changing the sanitary napkin. When menstrual blood penetrates to the “alert line of coolness”, the PVA water-soluble film will dissolve to release menthol as a cool reminder to warn visually impaired women of changing napkins.Thus, it helps to prevent the embarrassment caused by menstrual blood leakage.