Perfluorocarbons, or PFCs, are a resistant chemical compound that provides water-repellence. Unfortunately, it is so resistant that it lacks the property of decomposition. Ending the life cycle of products with this treatment is then very demanding, as it burdens the environment. As such, the substance is not dangerous for the wearer of the product with this treatment, however it can be dangerous for watercourses or soil in the vicinity of the production. Most brands operating in Europe should stop using PFC C8 (8 carbon atoms) for regulatory reasons, as the impact of this compound has been scientifically proven to be serious. The brands therefore resorted to C6 type impregnation (6 carbon atoms). But even that is not fully safe, it has only a smaller impact on the environment. If the brand uses the password "PFC-free", it should only be a modification completely without the presence of PFC, not with a C6 representation.