Kerastase Genesis Thermique Blow Dry Primer Heat Protectant for Weak or Damaged Hair Anti-Breakage Detangles and Hydrates without

4.64.8k ratings

338+ bought in the past month

$50.00

About this item

Defense Thermique Blow Dry Primer: A fortifying heat protectant spray for hair that is prone to falling due to breakage from brushing. Helps prevent split ends and leaves hair shiny & silky
Benefits: Strengthens and protects for heat styling. Enriched with ginger root and edelweiss native cells for 24H protection against frizz even in high conditioners of humidity.
Additional Benefits: After use, 99% less hair fall due to breakage from brushing and 88% experience smoother and conditioned hair. Leaves hair easy to detangle and calms down frizz
Suggested Use: Apply a small amount of treatment to lengths. Style as normal. Do not rinse. Can also be used on dry hair, to tame frizz and smooth ends. In case of contact with eyes, rinse immediately
Genesis Collection: Use along with Genesis Bain Hydra-Fortifiant Shampoo & Fondant Renforcateur Conditioner for hair that is healthy-looking through boosted nourishment & protection and less hair fall due to breakage

$50.00

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Product details

Product Benefits	Enriched with ginger root and edelweiss native cells for 24H protection against frizz and humidity
Hair Type	Straight, Wavy, Curly, and Coily Hair
Material Type Free	Sulfate Free
Scent	Floral
Liquid Volume	150 Milliliters

Technical specifications

is_discontinued_by_manufacturer	No
product_dimensions	1.57 x 1.57 x 7.09 inches; 6.3 ounces
item_model_number	E3244800
manufacturer	Kerastase
best_sellers_rank	#7,195 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #26 in Hair Thermal Protection Sprays

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Customer reviews

4.64,840 ratings

★★★★★

So good! Worth every penny

Krishayna Miller—October 6, 2025

The Kérastase Genesis Défense Thermique isn’t just a heat protectant — it’s hair armor. I spray it on before blow-drying or straightening, and my hair looks like glass — smooth, frizz-free, and so soft I can’t stop touching it. It smells absolutely divine (that signature Kérastase scent that lasts all day 😍) and doesn’t leave any stickiness or residue. My ends used to look fried after heat styling, but now they stay healthy and shiny — like I just walked out of a salon. It’s lightweight, nourishing, and seriously protective — my hair feels stronger with every use. Whether you use heat daily or just occasionally, this spray is a must-have in your routine. Read more

★★★★★

💗🌸

Emily—November 23, 2025

I love this thermal protector from Kérastase. Leaves the hair super soft, manageable and with a beautiful shine without leaving it heavy. It protects very well from heat and helps reduce breakage, especially if you use an iron or dryer. It smells delicious and the quality is noticeable from the first use. Highly recommended. Read more

★★★★★

A small amount goes a long way

LM—November 1, 2025

Has a wonderful smell. A small amount goes a long way and it’s really helping my hair stay healthier. Read more

★★★★★

Wonderful for hair

Candice W.—December 14, 2025

Wonderful product - instantly allows my long hair to de tangle and be combed easily Read more

★★★★★

A MUST HAVE FOR HOT TOOLS!

Customer—October 28, 2025

If you regularly use hot tools on your hair this thermal spray is an absolute must. It works great as a detangler right out of the shower and smells AMAZING! Read more

★★★★★

Highly recommended product . Kerastase Genesis Defense Thermique.

Yanet—October 31, 2025

My hair was very damaged and brittle, but from the very first application of Kérastase Genesis Défense Thermique, I noticed an incredible change. It’s now softer, more manageable, and protected from heat. Highly recommended for weak and damaged hair!🥰🥰🥰 Read more

★★★★☆

Good product

Rebecca Fray—April 10, 2025

This blow dry primer leaves my hair feeling soft, smooth, and way less frizzy. It also does a great job protecting from heat and detangling. But the spray nozzle isn’t great, it’s hard to control and sometimes sprays unevenly, which can be annoying. Read more

★★★★★

Great for fine frizzy hair

ALNJMNWA—January 7, 2026

This leaves my hair smooth, shiny, and much less frizzy, even in the PNW. It’s pricier than I think it should be, but it does a great job. Read more