Kérastase Première Sérum Filler Fondamental is a lightweight repair hair serum that repairs damaged hair strands from the inside out and has a formula suitable for all hair types. It makes damaged and dull-looking hair brighter and restores elasticity to the hair strands. Processed and damaged hair - due to the increased pore structure on its surface - absorbs 3 times more calcium in water during washing than untreated hair. This condition causes calcium accumulation inside and outside the hair strand. Kérastase Sérum Filler Fondamental care serum for damaged hair - with its light texture, it protects the surface of the hair without causing a feeling of weight. It strengthens the hair against external factors by filling the pores in the hair strands. It protects the hair from calcium accumulation caused by hard water, frizz caused by excess moisture, and heat up to 230°C. Frizz in the hair disappears and the hair becomes soft, elastic and easy to style. Use Kérastase Première Concentré Décalcifiant Réparateur as the first treatment to reduce calcium accumulation in your hair. At the end of the waiting period, apply Kérastase Bain Décalcifiant Réparateur Shampoo - followed by Kérastase Fondant or Masque Fluidité Réparateur - without rinsing. Finally, complete the care and repair process by using Kérastase Sérum Filler Fondamental anti-frizz and anti-breakage leave-in hair serum. Anti-frizz protection up to 72 hours* *Instrumental test - After Premiere Sérum Filler application Height: 90 ml Gender: UNISEX Age Group: UNISEX Purpose of Use: For All Damaged Hair