Kérastase Résistance Extentioniste Thermique, 150 ml, Hair Creams and Gels for Women, The Kérastase Résistance Extentioniste Thermique leave-in treatment gives your hair everything it needs after washing. Characteristics: improves the quality of the structure of your hair provides hydration and nourishment for your hair eliminates hair breakage has regenerative effects makes hair smell great How to use: Apply to towel-dried hair. Do not rinse. Comb. Style your hair as usual.