Kérastase Résistance Masque Thérapiste, 200 ml, Hair Masks for Women, The Kérastase Résistance Masque Thérapiste hair mask is an essential step in your hair care ritual. Give it a moment to regenerate and it will repay you with vitality and beauty. Characteristics: regenerates the hair along its entire length strengthens the hair fibre improves the elasticity of hair fibres hair is soft to the touch protects against harmful environmental effects How to use: Wash with shampoo, then apply to damp hair. Leave to act as instructed on the packaging, then rinse thoroughly.