The patent-pending TempSync Hipster from ThirdLove is the world's first thermoregulating undies. Fabric is infused with natural minerals to actively balance body temperature before you get hot. Perfect for staying cool through menopausal hot flashes. Better than breathable underwear, the innovative 37.5® Tech fabric is infused with natural minerals to actively balance body temperature before you get hot. This is the best cooling underwear for hot flashes and begins working before you ever start to sweat. The first-ever intimates collection featuring 37.5® Tech, engineered to fight hot flashes. Temp-regulating fabric keeps you cool Infused with natural minerals that control odor 100% cotton gusset Scratch-free, tagless label Mid rise Moderate rear coverage Imported Material & Care Nylon, spandex Machine washable