Is a regenerating hair mask perfect for thicker, severely damaged hair that has undergone excessive transformations. Specifically, this kérastase resistance thérapiste range is suitable for very rough, very brittle hair and in cases where deterioration of the hair fiber is visible. That said, this mask penetrates deeply into the hair fiber leaving it more repaired and restored. In this way, the fiber, from the inside, recovers all its strength and elasticity. Finally, the hair is much softer to the touch, shinier, full of energy, and much more revitalized