L'Oréal Professionnel Paris - Absolut Repair Molecular MAsk | 250 mLDescription When hair is damaged, its molecular structure, composed of peptides, is compromised. But most peptides are too big to be reinjected into the fiber, making damage almost irreversible. [RECOMMENDED FOR ALL DAMAGED HAIR] For all damaged hair: color treated, lightened & natural hair. Instruction of use For optimal results, use after Absolut Repair Molecular shampoo and rinse off serum. Apply evenly on towel dried hair. Leave in for 1 to 2