KÉRASTASE Fondant Extentioniste Strengthening Conditioner for Long Fragile Hair, 200ml – Amino Acids & Ceramides

KÉRASTASE Fondant Extentioniste is a repairing conditioner that strengthens fragile hair lengths, helps seal split ends and detangles to support visibly longer, healthier-looking hair.

Designed for long, fragile or over-processed hair, this creamy conditioner combines amino-acid technology with ceramides and Creatine R to restore tensile strength, improve manageability and lock in moisture. Lightweight yet nourishing, it targets mid-length to ends where breakage and split ends are most common, without weighing hair down. Use after the Extentioniste shampoo and follow with the mask in the Resistance collection for a routine focused on length retention and resilience.

How does this conditioner help stop breakage and promote longer hair?

The formula contains Creatine R and amino acids that penetrate weakened fibers to reinforce hair from within, while ceramides rebuild the outer cuticle for smoother, stronger lengths. By reducing tangles and friction, it lowers mechanical breakage that prevents hair from reaching its full length potential.

• Contains Creatine R and amino acids to fortify the hair cortex
• Ceramides help reseal and smooth cuticles to reduce split ends
• Detangles to minimize breakage from combing and styling

What results can I expect after using Fondant Extentioniste?

With regular use, hair feels softer, less knot-prone and appears smoother along the lengths and ends. Shine and moisture retention improve thanks to ceramides, and split ends look sealed—supporting a visibly healthier, elongated silhouette over time.

• Softer, more manageable lengths and reduced tangling
• Improved shine and moisture retention from ceramides
• Noticeably smoother ends and fewer visible split ends

How do I use this conditioner for best results?

After cleansing with Extentioniste shampoo, apply a quarter-sized amount to wet hair from mid-lengths to ends, avoid the roots if hair is oily. Leave on for 2–3 minutes to let active ingredients absorb, then rinse fully; for deep reinforcement, pair with the Resistance Extentioniste mask and follow a consistent routine.

• Apply to towel-dried hair, mid-length to ends only
• Leave 2–3 minutes before rinsing thoroughly
• Use with Extentioniste shampoo and Therapist Mask for best outcomes

Is this product suitable for color-treated or chemically processed hair?

Yes—its repairing and sealing action is intended for fragile, over-processed lengths and works well on color-treated hair. The conditioner helps protect treated hair by smoothing the cuticle and improving hydration, though it should be combined with color-safe routines if color retention is a priority.

• Formulated for weakened, chemically treated lengths
• Seals cuticles to lock in moisture and protect dyed strands
• Best used alongside KÉRASTASE color-safe products for maintenance

Who is this for: KÉRASTASE Fondant Extentioniste is ideal for anyone growing out hair or maintaining long lengths that are fragile, brittle or have been chemically processed. If you struggle with tangles, breakage at the mid-lengths and ends, or want a lightweight conditioner that supports length retention without heaviness, this product is formulated for your 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.