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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 Wednesday, Jun 10
Order within 12 hours and 55 minutes
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Features

  • 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

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: #7,282 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #24 in Hair Thermal Protection Sprays


#24 in Hair Thermal Protection Sprays:


Customer Reviews: 4.6 4.6 out of 5 stars (5,397)


Product Benefits: Detangling


Hair Type: Straight, Wavy, Curly, and Coily Hair


Scent Name: Floral


Item Form: Oil


Liquid Volume: 150 Milliliters


Number of Items: 1


Unit Count: 5.00 Fluid Ounces


Item Volume: 150 Milliliters


Brand Name: KÉRASTASE


Manufacturer: Kerastase


Global Trade Identification Number: 68


Item Weight: 6.3 Ounces


Material Type Free: Sulfate Free


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jun 10

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
  • PayTomorrow Financing
  • 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

    • Dual action fortifying hair care that smells incredibly amazing! Dual action fortifying hair care that smells incredibly amazing!
Review Image by Valerie Pham
Reduces breakage, strengthen hair, nourishing, leaving my hair, healthy, and smells amazing! I can style my hair without worrying about damage because it’s a blow dry primer heat protector. This is a must to have in my hair routine!
Reviewed in the United States on May 11, 2026 Reviewed in the United States on May 11, 2026 by Valerie Pham
    • Soft, protected, and frizz-free hair
This heat protectant is a must-have if you use hot tools. It leaves my hair feeling soft, smooth, and protected without weighing it down. I love how lightweight it is, and it helps reduce frizz while adding a healthy shine. A little goes a long way, so the bottle lasts a long time. Perfect for keeping hair strong and protected during styling! ... show more
Reviewed in the United States on May 4, 2026 by Genesis
    • 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
    • Amazing Amazing
Review Image by Veronica Sierra
Love this heat protectant it smells amazing g leaves my hair feeling so soft and just over all great quality !
Reviewed in the United States on May 5, 2026 Reviewed in the United States on May 5, 2026 by Veronica Sierra
    • Perfect to use daily
Smell so good keep the hair smooth and protect for the sun
Reviewed in the United States on April 13, 2026 by Gabriela Belaunde Saracho
    • Best Blow Dry Primer!
I will forever be a Kerastase stan purely because the quality of their products is unmatched! I use this blow-dry primer every single day, and I can assure you it is worth every dime! It smells amazing, reduces frizz, and has contributed to my overall hair health! A little goes a long way with this product, so you won't have to keep repurchasing a new bottle every month (personally, I have been using the same bottle for 3 months now, and I still have 3/4 of the bottle left). ... show more
Reviewed in the United States on March 11, 2026 by kristy youmell
    • Great First Impressions! Great First Impressions!
Review Image by Yurley Reyes
I just started using this product and I’m already loving the results. My hair feels softer, looks shinier, and doesn’t feel heavy at all. So far, I’m really impressed!
Reviewed in the United States on April 27, 2026 Reviewed in the United States on April 27, 2026 by Yurley Reyes
    • missing cap
great product but it arrived missing the covering so may have been used before
Reviewed in the United States on May 11, 2026 by Dawn

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