Product Overview Developed to remedy weakened hair, Kérastase Resistance Ciment Thermique 150ml is a leave in reconstructing milk that is activated by heat. Reduce breakage and strengthen and smooth hair with this formula from Kérastase. Benefits With a blend of Vita-Ciment® to make hair fibres more resilient from inside out, and Vita-Topseal to reinforce the external protective layer, hair will feel stronger and look smoother.