KERASTASE Résistance Masque Extentioniste Strengthening Hair Mask 200ml

KERASTASE Résistance Masque Extentioniste 200ml is an intensive strengthening and restorative hair mask for brittle, damaged hair and weakened lengths prone to breakage and split ends. Designed as part of the Extentioniste long-hair routine, it deeply conditions the fibre while helping restore strength, elasticity and smoothness so hair can maintain healthier-looking lengths.

Enriched with Creatine R and Maleic Acid, the formula helps reinforce the internal structure of weakened hair while sealing the cuticle for smoother, stronger and shinier lengths.

Strengthens weakened lengths – Helps restore the natural strength and resilience of brittle hair.

Anti-breakage care – Seals the cuticle to help protect weakened hair against further breakage.

Split-end care – Helps improve the appearance and condition of damaged ends.

Deep nourishment – Provides intensive conditioning from the lengths to the ends.

Improves shine & softness – Leaves damaged hair looking smoother, silkier and healthier.

200ml · Strengthening Hair Mask · Anti-Breakage · Long Hair · Brittle Hair · Split Ends

Best for: Long hair • Brittle hair • Weakened lengths • Breakage-prone hair • Split ends • Damaged hair • Hair being grown longer

What Is It?

KERASTASE Résistance Masque Extentioniste 200ml is the intensive deep-conditioning treatment within the Extentioniste collection.

KERASTASE describes it as a restorative mask for brittle and damaged hair, designed to penetrate the hair and restore weakened strands while providing nourishment from the lengths to the ends.

Its role is:

Deeply Condition → Reinforce → Improve Elasticity → Seal Cuticle → Reduce Breakage → Support Stronger Lengths

This is especially relevant for customers trying to grow their hair longer but experiencing:

Breakage → Split Ends → Weak Lengths → Frequent Trimming → Difficulty Maintaining Length

The objective isn't to stimulate faster biological hair growth. Instead, it helps improve the condition and resilience of the existing fibre so hair can remain stronger as it reaches longer lengths.

Masque Extentioniste vs Fondant Extentioniste

This distinction should be clear on Peggymou.

Fondant Extentioniste

→ Lightweight conditioner
→ Regular detangling and strengthening
→ Suitable when hair needs conditioning without the richness of a mask
→ Leave for approximately 2–3 minutes before rinsing

Masque Extentioniste

→ Intensive strengthening mask
→ Brittle or more damaged hair
→ Deeper nourishment
→ Greater focus on weakened lengths and split ends
→ Leave for approximately 5 minutes

So:

Regular/lightweight strengthening → Fondant Extentioniste

Brittle, damaged or more intensely weakened lengths → Masque Extentioniste

Customers don't necessarily need both after every shampoo.

Masque Extentioniste vs Masque Force Architecte

These products also occupy different territory within Résistance.

Masque Extentioniste
→ Long-hair goals
→ Weakened lengths
→ Breakage
→ Split ends
→ Maintaining stronger lengths

Masque Force Architecte
→ Damaged/weakened hair
→ Reconstruction
→ Repair-focused Résistance care

KERASTASE describes Résistance overall as anti-breakage care designed to strengthen and reinforce weakened hair, while specifically describing Masque Extentioniste as a deep-conditioning treatment for stronger hair reaching healthy lengths.

This gives Masque Extentioniste its own SEO territory around:

Long hair + breakage + split ends + length retention

Why You'll Love It

• Intensive strengthening hair mask
• Developed for brittle and damaged hair
• Ideal for weakened long hair
• Helps reinforce the hair fibre
• Supports improved elasticity
• Helps reduce further breakage
• Helps seal the cuticle
• Targets weakened lengths and ends
• Helps improve the appearance of split ends
• Provides deep conditioning
• Restores softness
• Enhances shine
• Helps hair feel smoother and silkier
• Supports healthier-looking long hair
• Enriched with Creatine R
• Contains Maleic Acid
• 200ml

KERASTASE specifically lists restored fibre strength, cuticle sealing, nourishment from lengths to ends and uniform shine among the benefits of Masque Extentioniste.

Who Is It For?

Ideal for:

Long hair
Hair being grown longer
Brittle hair
Damaged hair
Weakened lengths
Breakage-prone hair
Split ends
Hair lacking strength
Hair lacking elasticity
Rough damaged lengths
Hair requiring intensive strengthening care
Customers struggling to maintain healthy-looking long lengths

Pair Me With

KERASTASE Résistance Bain Extentioniste Shampoo  – The strengthening cleansing step for weakened hair. KERASTASE positions Bain Extentioniste around stronger, more resilient lengths.

KERASTASE Résistance Sérum Extentioniste Scalp Serum – The scalp-focused step within the long-hair routine, complementing the mask's focus on lengths and ends.

KERASTASE Résistance Thermique Extentioniste Heat Protectant – The essential leave-in partner for protecting the lengths against heat styling and helping minimise breakage.

Recommended Routine for Brittle Long Hair

Bain Extentioniste → Masque Extentioniste → Sérum Extentioniste → Thermique Extentioniste

The logic is:

Bain → Cleanse & strengthen

Masque → Deeply condition weakened lengths

Sérum → Scalp/root care

Thermique → Protect lengths & ends

KERASTASE describes Extentioniste as a root-to-tip routine targeting the roots, lengths and ends, with the goal of maintaining stronger hair throughout its length.

Resistance Masque Extentioniste Strengthening Hair Mask | Kérastase UK

Step 1
After having washing your hair properly and rinsed out your hair, towel dry-hair to remove any excess water.

Step 2
Use no more of a hazelnut-sized amount of mask and apply to hair length and ends to a weightless feel.

Step 3
Leave-in for 5 minutes and rinse thoroughly. .

Aqua, Water, Cetearyl Alcohol, Amodimethicone, Behentrimonium Methosulfate, Behentrimonium Chloride, Maleic Acid, Ethanolamine, Phenoxyethanol, Isopropyl Alcohol, Benzoic Acid, Trideceth-6, Hydroxypropyl Guar, Amyl Cinnamal, Hexyl Cinnamal, Benzyl Alcohol, Cetrimonium Chloride, Linalool, Hydroxycitronellal, Citronellol, Limonene, Benzyl Cinnamate, Creatine, 2-Oleamido-1, 3-Octadecanediol, Parfum, Fragrance.