Kerastase Resistance Serum Therapiste Oil: A double-action hair serum for very-damaged and over-processed hair. Its innovative formula associates a repairing cream and a binding serum for a thermo-protection reaching up to 450°F. Repairing the hair fiber instantly, it reinforces and smoothes the surface of the hair fiber. It also facilitates and makes blow-dry two times faster, sealing the ends of the hair to prevent split-ends.