KÉRASTASE Genesis Thermique Blow‑Dry Primer 5.1 oz — Heat Protectant to 450°F, Anti‑Breakage & Detangling

KÉRASTASE Genesis Thermique is a leave-in blow-dry primer that shields weak, breakage-prone hair from heat up to 450°F while detangling, hydrating and reducing frizz.

Designed for hair that loses strands from mechanical stress and styling, this lightweight thermal spray combines ginger root and edelweiss native cells to reinforce fiber resilience and smooth the surface. Use it before blow-drying or on dry hair to tame flyaways and make styling easier without adding heavy residue. It’s sulfate-free and formulated to pair with other products in the Genesis range for fuller-looking, more manageable hair.

How does this primer protect hair during heat styling?

The formula creates a protective layer that helps limit damage from high-temperature tools, preventing breakage caused by brushing and styling. It’s specifically engineered to provide heat defense up to 450°F while promoting a smoother finish that reflects light.

• Thermal barrier rated to 450°F for tool protection
• Lightweight mist that won’t weigh hair down
• Helps reduce split ends and friction during brushing

Will it improve detangling and reduce hair fall from breakage?

Yes — the primer detangles strands to lower mechanical stress when brushing, which reduces breakage-related fallout. Clinical-style figures from the formula indicate a major reduction in hair loss when used as directed, and many users see smoother, conditioned hair after application.

• Detangling effect makes combing easier and gentler
• Reported up to 99% less hair fall due to breakage from brushing
• 88% of users experienced smoother, conditioned hair after use

How should I apply it for best results and can it be used on dry hair?

Apply a small amount to damp lengths before blow-drying for optimal heat defense and styling control. You can also spritz onto dry hair to smooth frizz and refine ends between washes; the product is leave-in and does not require rinsing.

• Use on damp hair before blow-drying for protection and manageability
• Apply lightly on dry hair to tame frizz and smooth ends
• Do not rinse out; avoid contact with eyes and rinse immediately if contact occurs

What active ingredients help strengthen and smooth hair?

The primer blends ginger root extract with edelweiss native cells to support fiber strength and surface smoothness. These botanically derived components work with the product’s conditioning agents to reduce friction, lock in hydration, and help hair appear shinier and more resilient.

• Ginger root to help reduce breakage from brushing
• Edelweiss native cells to support fiber protection and longevity
• Formulated without sulfates for gentler daily use

Who is this for: KÉRASTASE Genesis Thermique Blow Dry Primer suits people with weak, fragile or chemically treated hair that sheds from brushing and styling. It’s a good pick for anyone who uses heat tools regularly and wants a lightweight, non-greasy leave-in that detangles, defrizzes and adds thermal protection. Pair it with Genesis Bain Hydra-Fortifiant shampoo and Fondant Renforcateur conditioner for an integrated routine targeting reduced breakage and improved manageability.

Ingredients

Water, Coconut Oil, Amodimethicone, Polyquaternium-37, Phenoxyethanol, Propylene Glycol Dicaprylate/Dicaprate, Xylitylglucoside, Sodium Hydroxide, Anhydroxylitol, Xylitol, Dimethicone Peg-7 Phosphate, PPG-1 Trideceth-6, Trideceth-6, Behentrimoniumchloride, Limonene, Xylose, Ethylhexylglycerin, Sorbitan Oleate, Linalool, Isopropyl Alcohol, Cetrimonium Chloride, Glycerin, Hydrolyzed Vegetable Protein PG-Propyl Silanetriol, Benzyl Salicylate, Coumarin, Zingiber Officinale Root Extract/Ginger Root Extract, Citral, Benzyl Alcohol, Citronellol, Benzyl Benzoate, Leontopodium Alpinum Callus Culture Extract, Potassium Sorbate, Tocopherol, Citric Acid, Xanthan Gum, Dipeptide Diaminobutyroyl Benzylamide Diacetate, Parfum/Fragrance.