Natracare super tampons are all made from only certified organic 100 percent cotton and were the world's first fully certified organic cotton tampons. Many women are unaware that rayon and rayon cotton blends are widely used in the manufacture of tampons. Rayon is commonly chlorine bleached, and is a highly absorbent fibre which rapidly absorbs menstrual blood but at the same time can also dry out the natural protective mucous lining of the vagina.They are non chlorine bleached and women can be reassured that they do not contain synthetic materials, such as rayon, or chemical additives such as binders or surfactants. Certified organic cotton removes the risk of direct exposure to residues from chemical pesticides and fertilisers used on traditional cotton.