Kérastase Resistance Force is a range specifically formulated for chemically treated or naturally weak hair. Hair is left stronger, smoother, revitalised & protected from daily aggressors. Enriched with the unique combination of active ingredients Intra-Cylane, pro-keratin & ceramides, this reconstructing shampoo gently cleanses whilst adding body & strength, to leave hair revitalised, supple, softer & more resistant. Ideal for brittle & very damaged hair.