Period proof underwear or menstrual underwear is the most sustainable choice when it comes to your period care. Menstrual underwear is underwear that you can wear during your period instead of using tampons, liners and pads. You can wear these briefs during the day or you wear these, quite sexy briefs during the night. Period proof underwear reduces the waste of sanitary products tremendously and they last up to several years when taken care of properly. Looking for other eco sanitary products? We got you covered!