Kérastase Résistance Masque Extentioniste is a strengthening mask designed to reinforce the hair fiber and promote healthy length retention. Enriched with Creatine R™ and maleic acid, it restores hair structure from root to tip, reducing breakage and split ends. Hair feels stronger, smoother, and more resistant as it grows. Ideal for those seeking longer, healthier hair. For a complete routine, pair with Bain or Sérum Extentioniste. Directions:Apply to washed, towel-dried hair. Distribute evenly through mid-lengths and ends. Leave on for 5–10 minutes. Rinse thoroughly. Use 1–2 times per week.
