KÉRASTASE Genesis Thermique Blow Dry Primer Heat Protectant Spray 5.1 oz — Strengthens, Detangles & Controls Frizz

KÉRASTASE Genesis Thermique Blow Dry Primer is a lightweight heat-protectant primer that detangles, reduces breakage during styling, and shields weakened hair up to 450°F for smoother, frizz-controlled blowouts.

Designed for hair prone to breakage and mechanical stress, this salon-grade blow-dry primer combines protective heat defense with strengthening botanicals. Formulated with ginger root and edelweiss native cells, the spray helps hydrate strands, ease detangling, and leave hair soft and glossy without weighing it down. Use it before blow-drying or on dry hair to tame flyaways and smooth ends.

How does this primer protect hair during blow-drying?

The Thermique primer creates a protective barrier that withstands high heat, helping to reduce damage from hot styling tools. In addition to heat defense, the formula conditions the hair surface to minimize friction and splitting while blow-drying.

• Thermal protection up to 450°F to limit heat-related stress.
• Lightweight spray that coats strands evenly for consistent protection.
• Conditions cuticle to reduce friction during brushing and styling.

Will it help with hair that breaks when I brush or style it?

This primer targets hair weakened by mechanical damage, helping to reduce breakage caused by brushing and styling. Clinical usage data from the Genesis range indicates a significant reduction in hair fall linked to breakage when used as directed.

• Formulated to strengthen fibers and improve elasticity against pulling forces.
• Reported reduction in hair fall due to breakage after application.
• Improves detangling so brushes glide more easily through the hair.

What sensory and cosmetic benefits can I expect after using it?

Beyond protection and strengthening, the spray leaves hair feeling smoother and looking shinier. It controls frizz for up to 24 hours, helping create a polished blowout with softer texture and improved manageability.

• Hydrates lengths for a silky, less frizzy finish.
• Helps smooth ends and reduce visible split-end appearance.
• Light conditioning effect without residue or heaviness.

How do I use KÉRASTASE Genesis Thermique for best results?

Apply a small amount to towel-dried lengths before blow-drying, or mist onto dry hair to smooth flyaways and tame frizz. It layers well with other Genesis products—use the Bain Hydra-Fortifiant shampoo and Fondant Renforcateur conditioner for a complete routine focused on nourishment and breakage reduction.

• Spray evenly on damp hair, focusing on mid-lengths to ends; do not rinse.
• Blow-dry or style as usual; reapply lightly on dry hair to smooth ends.
• Avoid contact with eyes; rinse immediately if contact occurs.

Who is this for? KÉRASTASE Genesis Thermique Blow Dry Primer is ideal for people with weakened, thinning, or mechanically stressed hair who regularly heat-style and want to minimize breakage and frizz. It suits all hair types seeking a lightweight, strengthening pre-styling product—especially those using blow-dry tools, brushes, or heat-based finishes and anyone who wants easier detangling and a smoother finish without heavy conditioners.

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.