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Kerastase

Kerastase Genesis Thermique Blow Dry Primer, Heat Protectant for Weak or Damaged Hair, Anti-Breakage, Detangles and Hydrates without Frizz, Sulfate Free and Defense Thermique, 5.1 Fl Oz

  • Based on 4,601 reviews
Condition: New
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Availability: Only 5 left in stock, order soon!
Fulfilled by Amazon
Arrives Thursday, Feb 12
Order within 20 hours and 22 minutes
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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


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: #7,748 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #28 in Hair Thermal Protection Sprays


#28 in Hair Thermal Protection Sprays:


Customer Reviews: 4.6 4.6 out of 5 stars (4,920)


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Feb 12

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
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  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • So good! Worth every penny
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. ... show more
Reviewed in the United States on October 6, 2025 by Krishayna Miller
    • 💗🌸
Review Image by Emily Emily
Review Image by Emily Emily
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. ... show more
Reviewed in the United States on November 23, 2025 by Emily Emily
    • Smell is great
Love the smell!
Reviewed in the United States on January 28, 2026 by Debby
    • Amazing!
Amazing!!! Best leave-in so far. My hair is light-weighted and looking healthy again!
Reviewed in the United States on January 29, 2026 by Marta G.
    • Great for fine frizzy hair
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.
Reviewed in the United States on January 7, 2026 by ALNJMNWA
    • Good product
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.
Reviewed in the United States on April 10, 2025 by Rebecca Fray
    • Wonderful for hair
Wonderful product - instantly allows my long hair to de tangle and be combed easily
Reviewed in the United States on December 14, 2025 by Candice W.
    • A MUST HAVE FOR HOT TOOLS!
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!
Reviewed in the United States on October 28, 2025 by Amazon Customer

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