SCHWARZKOPF GLISS STRENGTH & RESISTANCE 200ml Intensive strengthening mask suitable for weak and damaged hair. Delightful care that offers: Up to 16 times stronger hair. Protection against future damage. Keratin Repair: Liquid keratin rebuilds hair and renews its quality, repairing damaged areas both inside and on its surface.Use: After shampooing, massage into damp hair and leave for at least 1 minute. Rinse thoroughly! Use 2-3 times a week.