These sleek Natural Panty Liners can be used during your menstrual cycle on light days or as a tampon back up. Others use them on a daily basis for light incontinence and bladder control. Either way, they?ll leave you feeling fresh and help prevent irritation because they are made with 100% chlorine free cotton Cotton is hypoallergenic by nature and its long soft fibers allow air to flow through to the vagina for a soothing feel. Plastic and other common ingredients like wood pulp, rayon and viscose used in some other brands, block the passage of air to the vagina, sometimes causing the development of a heat damp environment that irritation-causing bacteria thrive in.