Kérastase Serum Thérapiste is a repairing hair serum that seals split ends and protects against heat styling - Ideal for both fine and thick hair. Erosion Levels 3-4. Key Benefits: Instantly heals and seals the ends of the hair Split ends appear reduced High heat protection of up to 230°C Combines oil-based care with cream-textured top coat Key Ingredients: FIBRA-KAP™ (Keratin Associated Proteins) - KAP make up 50-60% of hair's structure. When hair is damaged, these proteins are lost. Fibra-KAP is a powerful complex to restore missing proteins and restore strength to hair fibre Sève de Résurrection - The resurrection plant that can survive extreme conditions (of dryness and dehydration) and has the capability to resurrect itself after 10 years of near death