Kérastase Résistance Soin Premier Thérapiste, 200 ml, Hair Masks for Women, The Kérastase Résistance Soin Premier 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 protects against harmful environmental effects strengthens the hair fibre gives hair a brilliant shine restores hair’s natural, healthy appearance restores hair structure How to use: Wash with shampoo, then apply to damp hair. Leave to act as instructed on the packaging, then rinse thoroughly.