Nixx Comfort Period Underwear are made from cotton and are absorbent, leak-proof and super comfortable. They have a specially designed panel that goes up the back of the Nixx to prevent any leaks. The inner protective panel is black, so there is no staining. Nixx Comfort comes with our special trade mark Nixx technology to manage your moderate to heavy flow days, without the need for any other sanitary product. Our underwear are reusable making Nixx both environmentally friendly and cost-effective.