Kérastase Résistance Ciment Anti-Usure, 200 ml, Hair Conditioners for Women, The Kérastase Résistance Ciment Anti-Usure 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: goes deep into the hair fibre regenerates the hair along its entire length gives hair a brilliant shine How to use: Leave to act as instructed on the packaging, then rinse thoroughly.