Biolage Fortetherapie Intensive Strengthening Masque by Matrix is perfect for damaged, chemically treated hair. This rinse-out masque repairs & strengthens your hair for increased softness, shine & manageability. The Vitaforce Technology used in this masque, strengthens, moisturises & adds shine to hair that has been weakened by chemical & environmental damage. To use: Work this masque into your clean, towel dried hair & leave in for up to five minutes before rinsing thoroughly.