Kerastase Resistance Ciment Thermique is the first thermo-activates reconstructing milk for weakened hair. A leave in treatment which strengthens, smooths & protects hair from roots to tips. Specially developed to us with heat, Kerastase Resistance Ciment Thermique seals reconstructing, active ingredients into the hair fiber. Patented Vita-Ciment technology reforms the inter-cellular structure of your hair. Vital-topseal resurfaces your hair, creating a smooth, protective layer. Hair is left feeling firm, supple & energised. Use this leave-in treatment before heat styling for reconstructed, nourished hair.