Kerastase Resistance Therapiste Hair Mask: Therapiste Masque is a thick butter-textured mask that repairs, restores hair, adds strength, and boosts elasticity to very damaged, over-processed hair. This mask revitalizes hair strands and locks in moisture so the hair has a silky smooth, hydrated look and feel. It contains first of its kind Fibra-Kap formula that is enriched with six amino acids to replenish protein and promote strong, healthy hair.