RESISTANCE EXTENTIONISTE lenght strengthening shampoo 250 ml RESISTANCE EXTENTIONISTE lenght strengthening shampoo 250 ml This strengthening shampoo is specially formulated to cleanse, fortify and condition your hair. It is enriched with ceramide and biotin to help improve hair's strength and elasticity, while also helping to reduce breakage. The gentle formula is paraben-free and sulfate-free, and it is suitable for all hair types. This shampoo will leave your hair feeling soft, shiny and healthy.