OLAPLEX 4-IN-1 is a highly concentrated reparative mask that adds intense moisture while providing shine and body to treat damaged hair. I have found this mask (and the whole Olaplex line) to be my Holy Grail of Hair Healthiness. This mask works quickly and efficiently to address dryness in even the most severe cases with professional-strength ceramides, oils, and 11 vital amino acids. The ingredients and patented technology provide a luxurious, in-salon deep conditioning treatment.