ThirdLove's patent-pending TempSync Hipster undie 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. Mid-rise Moderate coverage Tag-free Imported Material & Care Nylon, spandex Machine washable