KÉRASTASE Resistance Masque Extentioniste Strengthening Hair Mask, 6.8 fl oz — Protein Repair & Detangler

KÉRASTASE Resistance Masque Extentioniste is a protein-rich strengthening hair mask that detangles, repairs split ends, and helps reduce breakage so hair can grow stronger and longer.

This restorative mask is formulated for weakened, fragile lengths that need targeted reinforcement. Infused with amino-building ingredients—gluco peptide, wheat protein and native plant cells—it works into the heart of the fiber to rebuild elasticity and smooth the hair surface. Use it as a weekly intensive after shampoo to restore manageability, boost shine, and create a protective barrier against future damage.

How does this mask repair split ends and reduce breakage?

The mask replenishes proteins and strengthens the inner cortex where most breakage begins, while smoothing the cuticle to limit friction. Regular use fills weakened zones and helps seal frayed ends, which reduces the frequency of mechanical and chemical breakage without altering your natural growth rate.

• Targets the hair fiber with gluco peptide to reinforce core strength
• Wheat protein rebuilds elasticity and resilience
• Seals the cuticle for reduced friction and smoother strands
• Leaves a protective deposit that improves combability and shine

When and how should I apply the Extentioniste Masque for best results?

Use it on freshly washed, towel-dried hair as an occasional or weekly intensive treatment depending on damage level. Apply a small, quarter-sized amount from mid-lengths to ends, leave it on 5–10 minutes, then rinse thoroughly for immediate softness and long-term improvement in strength.

• After shampooing, towel dry to remove excess water
• Work evenly from mid-length to tips to avoid root buildup
• Leave 5–10 minutes for deep penetration before rinsing
• Pair with the Extentioniste shampoo and conditioner for a complete regimen

Will this mask work for all hair types and textures?

Formulated for all hair types, the mask focuses on reinforcing damaged lengths rather than altering natural texture. Fine to coarse hair can benefit, though fine hair may prefer shorter leave time or lighter application to avoid weighing hair down.

• Safe for color-treated and chemically processed hair
• Adjust amount based on strand density and porosity
• Delivers hydration without heavy silicone buildup
• Helps restore manageability across textures

What key ingredients make this mask effective?

The formula combines targeted proteins and plant-derived cells that support structural repair. These actives complement each other: proteins rebuild internal fiber strength while plant cells and peptides smooth and protect the outer layer for a balanced repair approach.

• Gluco peptide: reinforces the hair’s internal network
• Wheat protein: increases elasticity and resilience
• Native plant cells: support surface restoration and shine
• Hydrating base to improve slip and detangling

Who is this for: KÉRASTASE Resistance Masque Extentioniste is aimed at anyone with weakened or damaged mid-lengths and ends seeking a salon-grade strengthening treatment. It suits those who want to minimize split ends, improve detangling, and encourage stronger-looking lengths—ideal as part of a maintenance routine alongside the Extentioniste shampoo and conditioner.

Ingredients

Water, Hydroxypropyl Starch Phosphate, Quaternium-87, Stearyl Alcohol, Behentrimonium Chloride, Propylene Glycol, Amodimethicone, Caprylyl Glycol, Isopropyl Alcohol, Candelilla Cera/Candelilla Wax, 2-Oleamido-1,3-Octadecanediol, Trideceth-6, Arginine, Glutamic Acid, Chlorhexidine Digluconate, Limonene, Serine, Hydroxypropyltrimonium Hydrolyzed Wheat Protein, Benzyl Salicylate, Benzyl Alcohol, Citronellol, Hexyl Cinnamal, Cetrimonium Chloride, Geraniol, Glycerin, Trehalose, Tamarindus Indica Seed Polysaccharide, Myrothamnus Flabellifolia Leaf Extract, Fragrance.