René Furterer Absolue Kératine, 30 ml, Hair Masks for Women, The René Furterer Absolue Kératine 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 makes it easy to comb through and prevents damage 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.