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Rating: 3.9Based on 92 reviews
  • Most helpful positive
    No image available. Profile image for: user
    Rating: 5 out of 5

    Best product on the market

    If you often blow-dry, straighten, or curl your hair and notice it getting damaged, then this is the spray you need. I've used this in my routine and it really is an "all-in-one" product that does more than just protect against heat. What I like: Heat protection: It protects up to 230°C, which feels safe when using a flat iron. The hair never feels "burnt" or dry afterwards. Detangles: It works as a fantastic leave-in product. Just a few sprays on damp hair make the brush glide through without resistance – perfect if you have hair that tangles easily. Anti-frizz: It keeps flyaways in place all day, even when it's humid outside. The hair becomes incredibly soft and gains a natural shine. The scent: The Genesis scent is addictive! It smells luxurious and fresh without being overpowering. What’s less good: The spray bottle: It's good, but you have to be careful not to spray too much in one spot. A light mist over the whole hair is enough. The price: It's a more expensive heat protectant, but the 150 ml bottle is concentrated and lasts for several months even if you style your hair often. Conclusion: A lifesaver for anyone who wants to keep their lengths healthy despite frequent styling. It provides protection, moisture, and shine all in one. One of my absolute favorites from Kérastase!
    4273 views
  • The post was made 2 days
    Rating: 5 out of 5
    verified customer

    Perfect!

    Love both the scent and how the hair feels afterwards. Use it after showering on damp hair and think it's great that it also has heat protection. Recommend 💕🌷
    515 views
  • The post was made 1 month
    Rating: 3 out of 5
    verified customer

    Not for me!

    I think this smells incredibly good but unfortunately I don't think it adds anything to my hair (thick/frizzy/curly).
    1727 views
  • The user's roll: Lyko Creator. The post was made 1 month
    Rating: 5 out of 5

    ✨ My favorite step before blow-drying!

    Kérastase Défense Thermique is a product I always want close at hand when I’m blow-drying or styling my hair. I truly believe that heat protection is one of the most important steps in a hair routine, especially when you use heat regularly. What I like most is that it feels light in the hair. It’s easy to distribute through the lengths without making my hair feel heavy or greasy. After applying, the hair feels softer and more manageable, which makes styling much easier. 🤍 I also think the hair gets a really nice feel after blow-drying. It feels smoother, softer, and gains a lovely shine. I really like when a heat protectant doesn’t just feel like a “must-do” step but actually makes the hair nicer to style. ✨ The scent is also very lovely and gives that luxurious Kérastase feeling that makes the whole hair routine a bit more special. 🥰 I usually apply it to towel-dried hair before blow-drying and think it’s a super easy step that quickly became a natural part of my routine. For me, it’s mainly the combination of heat protection, softness, and shine that makes this so good. It’s perfect when I want to style my hair but also be a bit gentler on the lengths. A really lovely styling product for you who use heat and want your hair to feel soft, shiny, and well cared for even after blow-drying and styling. 🤍🔥
    2484 views
  • The post was made 1 month
    Rating: 4 out of 5
    verified customer

    nice product in wet hair

    Works well after the shower, but don’t put on too much because then it easily feels greasy in the hair!
    2323 views
  • The post was made 4 months
    Rating: 2 out of 5
    verified customer

    Didn’t work for me!

    I have medium thick, frizzy, and wavy hair. Used this along with heat treatment and it made my hair greasy quickly.
    2856 views
    • The user's roll: Customer service at Lyko. The comment was made 4 months
      Hi Camilla 👋😊 Thank you for sharing your experience 💗 So sorry that this didn’t suit your hair as you wished. Hair type and amount of product can definitely affect how it feels, especially on wavy and frizzy hair. This contains nourishing ingredients that can be a bit heavy for some hair types, especially if you use a little too much product. We really appreciate you taking the time to write a review ✨
      1 likes
  • The post was made 6 months
    Rating: 4 out of 5
    verified customer

    Great

    Good heat protectant, it is a bit creamy and not watery in consistency
    3898 views
  • The user's roll: Lyko Creator. The post was made 7 months
    Rating: 5 out of 5
    verified customer

    Very good

    Kérastase Genesis Défense Thermique is absolutely amazing! It protects the hair from heat, makes it soft and light without weighing it down. I've received so many compliments on how shiny and healthy my hair looks since I started using it ✨ #lykoreview #lyko #kerastase
    4072 views
  • The post was made 7 months
    Rating: 2 out of 5

    Makes hair greasy

    I really believed in this, but it smells like typical old lady scent, so citrus and old lady. If you use it in your hair after the shower, when the hair dries (either with a blow dryer or air drying), the hair will feel greasy and dirty. It gives no results at all. To not waste my money, I used it before the shower to then rinse it out. The hair became a bit easier to manage in the shower as it sort of detangled some knots, but I can't mention any other positive effect.
    3959 views
    • The user's roll: Customer service at Lyko. The comment was made 7 months
      Hey Cora 👋✨ Thanks for your honest review, sorry that this didn't work for you ❤️ To avoid a greasy feeling with Kérastase Genesis Defense Thermique, it might be good to start with a small amount and apply it from the middle of the lengths to the ends, so you don't get too much at the roots 🥰
  • The post was made 9 months
    Rating: 1 out of 5

    Smells like men's perfume

    Has been sitting in the bathroom cabinet because it smelled like men's perfume. Hope they change the fragrance because the product is good otherwise, but no one wants to walk around smelling like an old man.
    5344 views
    • The user's roll: Customer service at Lyko. The comment was made 9 months
      Hey 👋 Thank you for sharing your experience! I understand that the scent is important, so it's really unfortunate if it doesn't suit you, especially since you seem to like the product otherwise ❤️✨
      1 likes
  • The post was made 1 year
    Rating: 2 out of 5

    Unpleasant scent

    The function of this product is super good, it gets 5 stars. However, the horrible scent brings the rating down to only 2 stars. It’s a sharp, chemical smell that reminds me of something sprayed in a port-a-potty to mask other odors. Yes, you hear that I am disappointed. Kérastase is otherwise one of my favorite brands and I have always found that the other products I have tried smell wonderfully delightful, even addictive. I especially love the scent of the Densifique products. Mmmm :-D!
    7491 views
    • The user's roll: Customer service at Lyko. The comment was made 1 year
      Hey Madeleine! 👋💗 Thank you so much for your review 🤗 We really understand that it can be disappointing when a favorite doesn't live up to expectations, especially when it comes to the scent, some love the scent while others don't like it as much 🌸 So nice to hear that you otherwise like Kérastase and their lovely scents! ✨💆🏼‍♀️ Have a great day! 💫
      1 likes

KérastaseGenesisDefense Thermique leave-in 150 ml

439 kr*
Recommended price 522 kr
WOW-price

Free delivery option available, can be sent immediately

* Cannot be combined with discount codes.

Anti hair-fall fortifying blow-dry fluid for weakened hair, prone to falling due to breakage. This milky formula provides anti-breakage protection and optimal hydration without frizz or weighing down the hair. Enriched with the combination of Edelweiss Native Cells and Ginger Root, Defense Thermique hydrates, reinforces and protects the hair from heat up to 220°C to reduce the risk of hair-fall due to breakage. Hair is shiny and soft with a silky touch.

Use:
ON TOWEL-DRIED HAIR: Use 2 to 4 pumps, depending on the length and thickness of the hair. Comb to evenly distribute the product. Proceed to blow-dry or air dry.
ON DRY HAIR: Apply to dry hair after blowdrying or airdrying as a finishing touch to tame frizz and boost shine. Style as desired.

150 ml

Also available in bundle

Kérastase
Genesis
2 069 kr
Without bundle: 2 074 kr
Kérastase
Genesis
1 899 kr
Without bundle: 1 905 kr

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