Activated by heat, the Kérastase Resistance Ciment Thermique is a leave-in hair milk that diminishes visible breakage, brittleness and split ends. Formulated with the brand’s patented Vita-Ciment® Topseal, the treatment provides a protective top coat over the lengths, defending them from heat damage caused by styling tools and sun rays. Plus, its lightweight, conditioning consistency leaves the hair feeling soft and smooth with a silk-like shine.