Nudah Basics underwear have different layers of fabrics that help absorb fluids and prevent leaks: Breathable layer of 100% Peruvian organic pima cotton with a natural antibacterial wash that helps you feel dry and reduces bad odors, bacteria and humidity. Absorbent layers of cotton or polyester (depending on the style) that absorb and trap fluid so you feel safe. Waterproof polyester layer that prevents leaks so you don't have to worry. The body of the underwear is made of microfiber, a very soft and flexible fabric that adapts to your body.