For frizzy and unmanageable hair. Salon proven to moisturize as well as Kerastase (Kerastase Resistance Ciment Thermique. Kerastase is a registered trademark of L'Oreal SA). Natural keratin protein in hair depletes over time leaving it unmanageable, frizzy, and harder to style. Keralock Technology infuses keratin. This dual-action lightweight formula, enriched with Keralock Technology both infuses keratin inside the hair fiber for ultimate moisturization and helps protect hair while heat styling.