Help repair damage with the use of Peptides Bonder and 5 Amino Acids. Up to 82% more strength*. Restore hair's original elasticity & movement**. For the first time, L’Oréal's Advanced Research team successfully managed to decompose peptides, to inject their components separately into the fibre***. Once inside, they reform & rebuild the molecular structure of the hair**. The Leave-In Mask has heat protection up to 230°C/450°F****. *Brushing test vs sensitised hair. **Instrumental test after 5 applications of shampoo + rinse off serum. ***Amino acids & peptides bonder. ****Instrumental test on Leave-In Mask.