Caviar Restructuring Bond Repair Leave-In Overnight Rescue is a deeply restorative leave in treatment. Formulated with strand-building proteins to help restructure strands, filling in gaps & tears in the cuticle and strengthening the hair to protect from breakage & future damage. Transforms previously coarse hair, significantly improving smoothness, texture & manageability. Key product benefits are derived from strand-building proteins, which target damage at the microscopic level, working to repair each individual strand of hair.