Kerastase Fusio-Dose Concentre [H.A] Ultra-Violet is a part of Fusio Dose family of professional hair treatments with unique formulas containing highly concentrated active ingredients designed to resolve all your hair concerns. Kerastase Fusio-Dose Concentre [H.A] Ultra-Violet is meant to reveal luminous colder, shinier blond and instantly neutralize brassy and yellow undertones as main concern and it must be combined with the booster of your choice to address a secondary hair concern. The beauty of the Fusio-Dose is that you can create a tailor-made solution based on your hair needs and combine different hair treatments into ONE by mixing concentrate with different type of boosters to address your hair needs. The freshly fused treatment with initial dose of goodness will fundamentally treat your hair and immediately transform it for lasting results.