KÉRASTASE Résistance Extentioniste Thermique Heat-Protecting Leave‑In Cream — Strengthens Mid‑Lengths, Seals Split Ends (Heat Defe

KÉRASTASE Résistance Extentioniste Thermique is a leave-in heat-protectant cream that strengthens mid-lengths and ends, seals split ends, and reduces breakage during heat styling.

Designed for hair that’s growing longer or showing signs of mechanical stress, this lightweight cream works as a blow-dry primer and daily protector. Its formula combines Creatine R, ceramides and taurine to reinforce the hair fiber, help retain moisture and improve elasticity while offering thermo-protection up to high styling temperatures. Use after shampooing on damp hair to help create smoother, stronger lengths with less visible damage.

How does this product protect hair during heat styling?

The Extentioniste Thermique creates a protective layer that reduces friction and shields the hair fiber from high-temperature tools. It specifically targets vulnerable mid-lengths and ends where breakage and split ends are most common, helping hair withstand the mechanical stresses of blow-drying and hot tools.

• Heat defense rated up to 450°F for styling protection.
• Blow-dry primer reduces hair breakage from heat-based styling.
• Lightweight texture coats strands without weighing hair down.
• Use on damp hair before blow-drying for best results.

What strengthening ingredients are included and what do they do?

The formula centers on Creatine R, a peptide-like amino acid complex that reinforces the internal structure of the hair fiber. Ceramides help rebuild and smooth the cuticle for improved shine and reduced porosity, while taurine supports hair resilience under styling stress.

• Creatine R: restores and fortifies the fiber internally.
• Ceramides: seal and smooth the cuticle, enhancing shine.
• Taurine: promotes elasticity to reduce snapping during styling.
• Combined action: targets both strength and surface condition.

How should I apply Extentioniste Thermique for best results?

Apply a quarter-sized amount to clean, damp hair and distribute evenly from the mid-lengths to the ends—these areas are the product’s focus. Finish with a blow-dry or other heat styling; it functions as both a primer and daily leave-in to help protect and smooth hair.

• Start with towel-dried hair to avoid diluting the product.
• Work through mid-lengths and ends; avoid roots for root lift.
• Comb or finger-style for even coverage before heat styling.
• Pair with Résistance Extentioniste shampoo and conditioner for a complete regimen.

Will it help with split ends and longer-term hair health?

While no topical can permanently repair a split end once the fiber is severed, this leave-in cream seals and smooths the cuticle to make split ends less noticeable and slow further abrasion. Regular use as part of a strengthening routine reduces breakage probability and supports healthier-looking lengths over time.

• Seals and smooths split ends for a tidier appearance.
• Helps reduce new breakage when used consistently.
• Best results seen in combination with other Résistance Extentioniste products.
• Not a substitute for trimming severed ends when needed.

Who is this for: KÉRASTASE Résistance Extentioniste Thermique suits anyone with weakened, length-seeking hair that needs protection and reinforcement—especially those who regularly blow-dry or heat-style. It’s ideal for mid-lengths and ends that show fragility, reduced elasticity or surface roughness; use it as part of a targeted regimen alongside the Extentioniste shampoo and conditioner to promote stronger lengths and a neater finish.

Ingredients

Water, Isopropyl Myristate, Dimethicone, Triethanolamine, Amodimethicone, Phenoxyethanol, Carbomer, Polyquaternium-4, Potato Starch Modified, Hydroxypropyl Guar, Behentrimonium Chloride, Trideceth-6, Amyl Cinnamal, Hexyl Cinnamal, Isopropyl Alcohol, Benzyl Alcohol, Linalool, Hydroxycitronellal, Cetrimonium Chloride, Citronellol, Limonene, Benzyl Cinnamate, Creatine, 2-Oleamido-1,3-Octadecanediol, Taurine, Parfum, Fragrance.