The strengthening hair mask Kérastase Genesis Masque Reconstituant intensely nourishes weakened hair fibres and provides hair with the hydration and nourishment it needs. Its delicate creamy texture penetrates deep into the hair, leaving it stronger, reinforced and protected against breakage. Thanks to its natural active ingredients, the mask visibly reduces hair loss. Hair is soft, shiny and strengthened directly from the roots, reducing the risk of hair fall.