"Known as “forever chemicals”, PFA's are found in non-stick pans, fast food packaging, firefighting foams, and more. PFAs are called forever chemicals because their chemistry keeps them from degrading in normal environmental conditions. Some period brands use PFA's as part of their anti-stain features. The danger of PFAs is greater if ingested. Some brands have been found to use these chemicals in the production of period underwear —in the “moisture wicking” layer—bringing PFA's in direct contact with the vagina which causes major concern about the health impact these might have. Because we don’t know the possible impact that these chemicals might have, WUKA stands firm in its commitment to not include any level of traceable PFAs is our products. Because period pants (and regular pants!) are worn in a very sensitive area, it’s important they are made from natural materials that are kind to skin. A reminder of what WUKA products are made of: WUKA Ultimate Midi Brief, Ultimate Boxer Shorts, Bralette, Everyday Midi Brief and Bikini, and Ultimate High Waist are made from Tencel. WUKA Ultimate Bikini Brief and Ultimate Lace Period Pants are made from GOTS organic cotton (Global Organic Textile Standard). This is guaranteed to be 95% Cotton and 5% elastane. Our Perform range is made from recycled nylon. The Basics range is made from BCI certified cotton! The newest repurpose range is composed of Repurposed fabric (recycled nylon) and a cotton gusset! New Seamless Flex Stretch period pants are made from super-soft Tencel, a super soft and elasticated material that offers you maximum comfort and leak-free coverage."