KÉRASTASE Fondant Extentioniste Strengthening Conditioner 200 ml — Repairs Lengths, Seals Split Ends

KÉRASTASE Fondant Extentioniste is a strengthening rinse-out conditioner formulated with amino acids, Creatine R and ceramides to detangle, reinforce damaged lengths and help seal split ends for visibly healthier, longer hair.

This rich, restorative conditioner is part of KÉRASTASE's Extentioniste line, created to support fragile, over-processed or long hair that needs reinforcement from mid-length to ends. It works after cleansing to smooth cuticles, add manageability, and improve the texture of weakened strands without weighing hair down. Use it alongside the Extentioniste Shampoo and the specialist hair mask for a complete routine addressing tensile strength and length retention.

How does this conditioner repair and protect fragile lengths?

The formula blends amino acids and Creatine R to bolster hair fibers while ceramides help rebuild the surface and lock in moisture. It smooths raised cuticles to reduce friction, which can lower breakage and make hair easier to comb when wet.

• Creatine R supports the internal structure of hair fibers for improved resistance.
• Amino acids help restore protein balance in weakened areas.
• Ceramides seal the cuticle, aiding shine and moisture retention.
• Detangling agents reduce knots and mechanical damage during brushing.

Will it weigh my hair down or leave residue?

Fondant Extentioniste is formulated as a creamy rinse-out conditioner that conditions without heavy buildup when used as directed. Applied from mid-length to ends and rinsed after a short leave-in time, it leaves strands soft and manageable while preserving natural movement.

• Use a quarter-sized amount for medium lengths; adjust for hair density.
• Apply mainly to mid-lengths and ends to avoid root heaviness.
• Rinse thoroughly after 2–3 minutes to prevent product buildup.
• Pair with the matching shampoo for balanced cleansing and conditioning.

How should I incorporate it into my haircare routine for best results?

For an effective regimen, start with the Extentioniste Shampoo, then apply the Fondant Extentioniste conditioner to wet hair, focusing on problem lengths. For deeper reconstruction, alternate or follow with the Extentioniste Mask to reinforce and protect over-processed areas.

• Shampoo first to remove surface impurities and open cuticles slightly.
• Apply conditioner from mid-length to tips, leave 2–3 minutes, then rinse.
• Use the Therapist Hair Mask weekly for intensive reinforcement.
• Regular use supports smoother, easier-to-manage lengths over time.

What visible benefits can I expect and how quickly?

Users typically notice improved detangling and a softer texture immediately after rinsing. Over continued use, hair appearance benefits include increased shine, fewer visible split ends, and improved manageability as cuticles become smoother and lengths feel stronger.

• Immediate: easier combing and reduced knots after conditioning.
• Short term: enhanced shine and smoother surface from ceramides.
• Ongoing: strengthened lengths and lower breakage with repeated use.
• Best results when combined with the full Extentioniste line.

Who is this for: KÉRASTASE Fondant Extentioniste is designed for people with long, fragile or chemically-treated hair looking to reinforce lengths, reduce breakage while detangling, and improve surface shine. It suits anyone seeking a lightweight yet nourishing conditioner to maintain longer hair and minimize split ends when used as part of a targeted care routine.

Ingredients

Aqua, Water, Cetearyl Alcohol, Propylene Glycol, Maleic Acid, Behentrimonium Methosulfate, Ethanolamine, Stearamidopropyl Dimethylamine, Glycerin, Phenoxyethanol, Hydroxyethylcellulose, Quaternium-91, Polyquaternium-37, Benzoic Acid, Paraffinum Liquidum, Mineral Oil, Cetrimonium Chloride, Cetrimonium Methosulfate, Amyl Cinnamal, Hexyl Cinnamal, Benzyl Alcohol, Ppg-1 Trideceth-6, Linalool, Hydroxycitronellal, Acrylates Copolymer, Citronellol, Limonene, Creatine, 2-Oleamido-1, 3-Octadecanediol, Benzyl Cinnamate, Sorbitan Oleate, Ci 19140, Yellow 5, Ci 42090, Blue 1, Parfum, Fragrance.