Targeting hair that’s broken, damaged, brittle or weak, Kérastase Resistance Ciment Anti-Usure - Vita Ciment Advance Duo is enriched with Pro-Keratin and Ceramide to give daily repair to fragile locks, reconstructing and strengthening from within whilst protecting the surface from any further damage. Powered by Kérastase\'s Vita-Ciment®, this reparative conditioner helps to rebuild damaged locks with Pro-Keratin - a potent ingredient that acts in the same way as naturally found Keratin in the hair. Keratin depletion occurs in damaged hair, exposing its cortex and making it vulnerable, weak and prone to split ends. Pro-Keratin works to give locks back their strength and solidity, fortifying the hair and repairing the damage. Cuticles are then sealed and smoothed with Ceramide, which also helps hair to retain its moisture effectively whilst strengthening it and encouraging better elasticity. An infusion of protein-rich Reserecttion Sap further renews, smooths and hydrates damaged and weak hair so it\'s left softer, stronger and revitalised. Protected with Kérastase\'s Vita TopSeal and deeply reconstructed from within, with daily use locks become more supple and health is restored. Apply to freshly shampooed damp hair, massaging in and leaving on for 2-3 minutes before rinsing well.