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

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.

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).

Smell so good keep the hair smooth and protect for the sun

Love this heat protectant it smells amazing g leaves my hair feeling so soft and just over all great quality !

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!

protected my very fine hair from the ravages of the straightening brush *and* super-hot curling irons. Great product, and great scent.

The scent is really nice — clean, fresh, and not overpowering. It feels lightweight and doesn’t leave my hair sticky or heavy, which I appreciate. That said, I personally get better smoothing and overall results with Olaplex No. 9. This one still performs well as a heat protectant and leaves hair soft, but for my hair type, Olaplex gives me a slightly smoother finish. Overall, it’s a good product, especially if you care about fragrance and lightweight text

great product but it arrived missing the covering so may have been used before

It has a good fragrance but doesn’t help with frizzy hair until used in large quantities.

Soin thermique efficace qui protège les cheveux lors du séchage ou du lissage. La texture est légère et ne laisse pas de résidu. Les cheveux restent souples, brillants et faciles à coiffer après utilisation. Le parfum est agréable et discret. Très bon produit pour protéger les cheveux au quotidien.

Les cheveux sont protégés et la coiffure est améliorée

I recently purchased the **Kerastase Genesis Defence Thermique Treatment** and I am very happy with my purchase. This treatment has become an essential part of my hair care routine. It provides excellent protection for weakened hair, helping to prevent breakage and heat damage. The lightweight formula is easy to apply and doesn't weigh down my hair. I love how it leaves my hair feeling soft, smooth, and manageable. The Kerastase Genesis Defence Thermique Treatment is enriched with Edelweiss Native Cells, Ginger Root, and Aquaxyl, which help to strengthen the hair and provide intense hydration. It offers heat protection up to 230°C, making it perfect for use with styling tools. I have noticed a significant reduction in hair breakage since using this treatment. I also appreciate that this treatment is suitable for all hair types. Whether you have fine, thick, curly, or straight hair, the Kerastase Genesis Defence Thermique Treatment can benefit you. It helps to detangle and protect the hair from environmental aggressors, leaving it looking healthy and shiny. Overall, I highly recommend the Kerastase Genesis Defence Thermique Treatment to anyone looking for a high-quality heat protectant and strengthening treatment for their hair. It delivers on its promises and has made a noticeable difference in the health and appearance of my hair. I hope this review captures the essence of this fantastic treatment!

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