chevron-right Kérastase chevron-right Hair Care chevron-right Genesis chevron-right Defense Thermique
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
chevron-left
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
Defense Thermique - Genesis | L'Oréal Partner Shop
chevron-right

Genesis is the first dual action anti-fall haircare range: FOR ALL WOMEN, IN ALL LIFESTYLES, WITH ALL DEGREE OF HAIR FALL.
Powered with a cocktail of highly efficient ingredients to instantly strengthen and thicken the hair fiber for an immediate fuller look with more fiber strength, more fiber retention* and -84% less hair-fall**.

 

*Clinical study, 99 people, 6 weeks use.
**hair-fall due to breakage. Instrumental test on Bain Nutri-fortifiant + Masque Reconstituant + Ampoule/Sérum Aminexil.

 

HOW DOES GENESIS  WORK?
A double action for your client: 
Instantly: PROTECTS AGAINST DAILY EXTERNAL AGGRESSOR AND ANTIOXIDES thanks to Ginger roots and Edelweiss native cells.
Long Term: STOP HAIR-FALL FORTIFIES HAIR ANCHORAGE & RETENTION AND REDUCE HAIR-FALL FROM THE ROOTS thanks to Aminexil.

 

Défense Thermique benefits:
- Detangles and hydrates without frizz. 
- 24H protection against frizz even in high conditions of humidity. 
- Protects hair from blow-dry heat. 
- Helps to prevent split ends. 
- Leaves hair shiny and silky. 
- 99% less hair fall due to breakage from brushing*. 
- 49% softer hair*.

*After application of Défense Thermique.

 

WHO IS IT FOR? 
Genesis targets every woman with hair fall need that would be efficient, convenient and pleasurable with :
- Instant result of hair care
- Efficacy of anti-hair fall solutions

Prime with the Défense Thermique :

Step 1: Apply on wet lengths.
Step 2: Blow dry.
In case of contact with eyes, rinse them immediately and thoroughly.

 

Learn more on Access

Ask more information about this product

Genesis Défense Thermique is enriched with GINGER ROOT and EDELWEISS NATIVE CELLS.

GINGER ROOTS: Known for its ability to protect against daily external aggressors.

EDELWEISS NATIVE CELLS: Capable to resist the most extreme conditions and is known in skincare for its antioxidants. It also has power & collagen-preserving properties.


INGREDIENTS
AQUA / WATER / EAU • COCOS NUCIFERA OIL / COCONUT OIL • AMODIMETHICONE • POLYQUATERNIUM-37 • PHENOXYETHANOL • PROPYLENE GLYCOL DICAPRYLATE/DICAPRATE • XYLITYLGLUCOSIDE • SODIUM HYDROXIDE • ANHYDROXYLITOL • XYLITOL • DIMETHICONE PEG-7 PHOSPHATE • PPG-1 TRIDECETH-6 • TRIDECETH-6 • BEHENTRIMONIUM CHLORIDE • LIMONENE • XYLOSE • ETHYLHEXYLGLYCERIN • SORBITAN OLEATE • LINALOOL • ISOPROPYL ALCOHOL • CETRIMONIUM CHLORIDE • GLYCERIN • HYDROLYZED VEGETABLE PROTEIN PG-PROPYL SILANETRIOL • BENZYL SALICYLATE • COUMARIN • ZINGIBER OFFICINALE ROOT EXTRACT / GINGER ROOT EXTRACT • CITRAL • BENZYL ALCOHOL • CITRONELLOL • BENZYL BENZOATE • LEONTOPODIUM ALPINUM CALLUS CULTURE EXTRACT • POTASSIUM SORBATE • TOCOPHEROL • CITRIC ACID • XANTHAN GUM • DIPEPTIDE DIAMINOBUTYROYL BENZYLAMIDE DIACETATE • PARFUM / FRAGRANCE

1,720 reviews
5 stars
( 1,322)
4 stars
( 267)
3 stars
( 73)
2 stars
( 23)
1 star
( 35)
5
4.6 / 5 stars

yella0824

4

1.793591107E12 01/11/2026

Love this product

[This review was collected as part of a promotion.] this product is very nice it leave me hair so soft and smelling so good

Originaly posted on  kerastase-usa.com

Zozoss

5

1.793582107E12 01/11/2026

lovely smell

super lightweight and smells amazing. It almost feels like a hair perfume when I am blowdrying my hair, also protects against damage. I regularly do a at home blowout and haven't noticed any split ends.

Originaly posted on  kerastase-usa.com

Mara9012

5

1.793381412E12 30/10/2026

Love it

[This review was collected as part of a promotion.] Smell good and my hair is so pretty. Best of all. Shining 🌟

Originaly posted on  kerastase-usa.com

notmyhair

5

1.793299509E12 29/10/2026

Amazing results

[This review was collected as part of a promotion.] This product has changed my hair. I have fine, thin hair and this gives my hair a conditioned feel without the heaviness or weighing my hair down. It also has heat protectant so I don't need a separate product.

Originaly posted on  kerastase-usa.com

Eman A

5

1.793290516E12 29/10/2026

The best

Pricey but good, it’s helped my hair a lot. Will buy again.

Originaly posted on  kerastase-usa.com

Alic_81

5

1.793124011E12 27/10/2026

No frizz

This got rid of frizz in my hair and it smelled amazing. Great heat protection that I trust.

Originaly posted on  kerastase-usa.com

Long Hair Do Care

5

1.793061912E12 26/10/2026

It works!

I am new to using heat styling tools. I recently was introduced to a diffuser and a straightener. Let me say my hair thanks me for using this product. I put it on after I freshly wash it, pull water out with a towel. (squeeze don't rub) and spray on this. I allow my hair some natural dry time before brushing it to ensure even distribution and Vala, gorgeous results!

Originaly posted on  kerastase-usa.com

kmart98

5

1.79304841E12 26/10/2026

Obsessed. Been using for years!!!

[This review was collected as part of a promotion.] This is my tried and true. I have been using this for over 5 years now and my detangling and blow drying process game has changed

Originaly posted on  kerastase-usa.com

HairKare26

5

1.793024112E12 26/10/2026

Heat Protecting Hair Care

[This review was collected as part of a promotion.] I really like this heat protecting hair spray. Its lightweight, easy to apply and leaves my hair feeling smooth and well-styled. Also, the bottle is very pretty on my shelf.

Originaly posted on  kerastase-usa.com

Lala26

3

1.793033238E12 26/10/2026

Decent product. Not sure how good it is for me!!!!

[This review was collected as part of a promotion.] An ok product. Not amazing but decent. Don’t know if I would repurchase.

Originaly posted on  kerastase-usa.com

Reply from Consumer Care Center 26/10/2026

Hi there! Thanks for giving it a try. We’re glad you found it decent, though sorry it wasn’t a standout for you. We appreciate your honest feedback.

Sari S

5

1.792710006E12 22/10/2026

Best leave in serum

The best leave in serum it leaves my hair like silk 🤗

Originaly posted on  kerastase-usa.com

SiVive

5

1.792674011E12 22/10/2026

Excellent product

It leaves my hair super soft and it has a lovely fragrance that's lasts

Originaly posted on  kerastase-usa.com

Dione17

5

1.792612815E12 21/10/2026

Amazing product

I love this spray hair protectant. I’m able to comb through my hair after i spray it in my wet hair with ease. It also protects my hair and keeps it soft and smooth when I’m styling.

Originaly posted on  kerastase-usa.com

Melb11

5

1.79261101E12 21/10/2026

Hair

This product makes make hair look amazing and smells great

Originaly posted on  kerastase-usa.com

XtinaGonz

5

1.792601137E12 21/10/2026

Amazing

I loved the heat protectant spray. It smells nice and it leaves my hair soft and without frizz.

Originaly posted on  kerastase-usa.com

Sarahth

5

1.792449007E12 19/10/2026

I’ve purchased 3x!!

I love it!! I’ve purchased this 3 times and will continue to!

Originaly posted on  kerastase-usa.com

Paola Y

4

1.792365307E12 18/10/2026

4.5 ⭐️⭐️⭐️⭐️

Works great as a heat protectant but I find that leaves a slightly heavy residue on my hair. It’s not the worst but I definitely notice when my hair is down or when I try to brush it. The scent may be a little strong if you are sensitive to smells. I personally don’t mind it.

Originaly posted on  kerastase-usa.com

KFlorida

5

1.792254607E12 17/10/2026

Great to use for styling!

[This review was collected as part of a promotion.] My hair stylist uses this when I get my hair done, so I had to get it too for use at home. It helps keep my hair less frizzed up in a southern climate.

Originaly posted on  kerastase-usa.com

Jn2026

5

1.792170012E12 16/10/2026

Best leave in product!

[This review was collected as part of a promotion.] I love how it detangles and also is a heat protector.

Originaly posted on  kerastase-usa.com

Apar82

5

1.792122305E12 15/10/2026

Minimuzes damage

This product is great for protecting hair from heat damage. I’m using my second bottle now.

Originaly posted on  kerastase-usa.com

NatalieNB

5

1.792206904E12 16/10/2026

Amazing!

I ordered this because I got a new Tymo curling iron and I wanted a really good thermal protectant. But I this product is WAY more than just a heat protector. My hair changed from dry and inflexible to super soft and so full of volume and shine. I spray it on my hair directly from the shower and blow dry then curl my hair. My ends feel thicker and don't look broken or damaged anymore. It is lightweight and does not make my hair feel heavy or sticky at all. My curls stay in for 3 days and look great between washes. I love the way this product smells, soft and floral with a light citrus top note. Wonderful product.

Originaly posted on  kerastase-usa.com

Minaxx

5

1.791778506E12 12/10/2026

Love it

Not sticky or oily amd smell good amd it holds the styles very good without being heavy

Originaly posted on  kerastase-usa.com

Mimi22

5

1.791734418E12 11/10/2026

Great Ptoduct

Everytime I use this product I get compliments on how my hair feels and the smell

Originaly posted on  kerastase-usa.com

Mdarling2728

5

1.791658811E12 10/10/2026

Love it!

[This review was collected as part of a promotion.] Great smell. Makes your hair soft and silky. Highly recommend

Originaly posted on  kerastase-usa.com

Ary5834

5

1.791383417E12 07/10/2026

Smells amazing and feels amazing

This product is not heavy and leaves hair feeling wonderful. At first I was worried thinking it would make my hair oily because it’s a heat protector but no it gives shine and it is not heavy at all

Originaly posted on  kerastase-usa.com

Mgonzalez

5

1.79165701E12 10/10/2026

Amazing!

[This review was collected as part of a promotion.] This product is the best! Smells amazing and gave me the look that I wanted for my hair Highly recommended!

Originaly posted on  kerastase-usa.com

BarbieP

5

1.791208813E12 05/10/2026

Love genesis defense line

The genesis defense line is phenomenal. The product protects your hair, leaves it soft and silky.

Originaly posted on  kerastase-usa.com

CatloverJax

4

1.791134112E12 04/10/2026

Heat protection

Works well and helps prevent damage to hair when styling. Would recommend

Originaly posted on  kerastase-usa.com

Mickey11

5

1.791074706E12 03/10/2026

So good

[This review was collected as part of a promotion.] It protects my hair from hair dryer and it makes my hair smells good

Originaly posted on  kerastase-usa.com

Kathy1726

5

1.790903707E12 01/10/2026

Protects your hair

[This review was collected as part of a promotion.] I wasn’t sure at first about this product but after many uses I can see the difference in every blowout I really recommend getting it

Originaly posted on  kerastase-usa.com

TarLeh

5

1.790892908E12 01/10/2026

Great heat protection

[This review was collected as part of a promotion.] This really keeps my fine hair safe from heat styling. A little goes a long ways. Smells fantastic too!

Originaly posted on  kerastase-usa.com

Beth75

5

1.790891109E12 01/10/2026

Love it

[This review was collected as part of a promotion.] Love this product it smells amazing and makes my hair silky soft

Originaly posted on  kerastase-usa.com

Jamer4

5

1.79089021E12 01/10/2026

Smells so good!!

[This review was collected as part of a promotion.] Love this so much! It smells so dang good! Love how it makes my hair feels

Originaly posted on  kerastase-usa.com

Anonymous

5

1.791178208E12 05/10/2026

Te best heat protector

[This review was collected as part of a promotion.] I use heat every day and my hair looks healthy with minimal damage and no dryness

Originaly posted on  kerastase-usa.com

Ebeaulha

4

1.790820907E12 30/09/2026

Non greasy 👍🏻

I like this product. It’s non greasy and smells great! But the spray nozzle doesn't produce a fine mist; instead, it shoots the liquid off in the wrong direction.

Originaly posted on  kerastase-usa.com

Bella 1190

5

1.790700321E12 29/09/2026

Game changer for blow drying

It took my a long time to find a product that worked for my thin hair and as a new girly learning to do her hair at home ! This protects my hair gives shine and does not smoke when blowing

Originaly posted on  kerastase-usa.com

Ria287

5

1.790645408E12 28/09/2026

Amazing!!!

The best heat protectant! I feel like my hair stays healthy!

Originaly posted on  kerastase-usa.com

Leskaa

4

1.790444711E12 26/09/2026

Its ok

[This review was collected as part of a promotion.] Not sure how i feel. I have fine hair and use a little bit and hair still feels oily the next day.

Originaly posted on  kerastase-usa.com

Julieeee726

5

1.790365514E12 25/09/2026

Total Game Changer

[This review was collected as part of a promotion.] This product strengthens my weak, over processed blond hair and I barely have any hair fall. Absolutely recommend!!

Originaly posted on  kerastase-usa.com

Trinha22

5

1.790362813E12 25/09/2026

My daughter swears by this leave in

I’ve purchased this leave in treatment for my daughter a few times now and she said she cannot live without it. It has transformed her hair to much more shiny, soft, and healthy.

Originaly posted on  kerastase-usa.com

OohLala911

5

1.790361913E12 25/09/2026

FL Frizz Fighter!

I love the effects of this leave-in product: moisturizing enough to help fight against the Florida humidity and my constant phrase but light enough to not weigh my hair down or leave it greasy. The scent is divine and a little goes a long way. Can't wait for the rest of my Genesis treatment system to come in the mail

Originaly posted on  kerastase-usa.com

AprilD

5

1.790280914E12 24/09/2026

Smells delicious

Smells wonderful. This a nice heat protecting spray

Originaly posted on  kerastase-usa.com

Mila2mila

5

1.789833881E12 19/09/2026

Pretty good

I really liked it! It moisturizes the hair while protecting it. It smells good, but it weighs the hair down a bit.

Originaly posted on  kerastase-usa.com

Love shampoo

5

1.789833881E12 19/09/2026

Love heat protection

[This review was collected as part of a promotion.] This is the best heat protection I have had by far

Originaly posted on  kerastase-usa.com

Texas Canuck

5

1.790010017E12 21/09/2026

Can’t live without it

I use this product every time I blow dry my hair, it smells great and protects my hair. My hair easily gets damaged from heat but this product has made a tremendous difference in how my hair handles a blow dry. My stylist introduced me to it and I am now using it daily.

Originaly posted on  kerastase-usa.com

Sisi88

5

1.789515015E12 15/09/2026

loved it! Super soft and smells amazing

[This review was collected as part of a promotion.] The difference is immediate: it leaves the hair very soft with a delicious scent. I still haven't used it with heat, but I am fascinated by the results. Great product!

Originaly posted on  kerastase-usa.com

Orange Beach Tricia

4

1.78907943E12 10/09/2026

Great

It helps protect my hair from the heat from blow drying and curling or flat iron.

Originaly posted on  kerastase-usa.com

Eringill1007

5

1.789467318E12 15/09/2026

Hair protect

[This review was collected as part of a promotion.] I love this hair protectant. It does smell good as well. I would not go without it.

Originaly posted on  kerastase-usa.com

KaylaLB

5

1.789368318E12 14/09/2026

Great addition to my routine

Loving this product for fine frizzy hair! Apply evenly to towel dried hair and my blowouts are smooth and less frizz throughout the day without weighing it down

Originaly posted on  kerastase-usa.com

ElsieC

5

1.789467318E12 15/09/2026

Another great Genesis product

[This review was collected as part of a promotion.] I may be biased because I’m in love with the entire Genesis line and this is my newest addition. My hair is fragile now and rarely use heat but will use this when I do. The scent is gorgeous.

Originaly posted on  kerastase-usa.com

LilCat

5

1.788997509E12 09/09/2026

My favorite of all their collections

The SCENT!!! Oh my! People sniff me lol! But aside from that, this whole collection has transformed my hair! It’s thicker stronger and just so pretty air dried!! Yes air dried everyday! Read more reviews from other products I used if this collection!! It’s a must try!!

Originaly posted on  kerastase-usa.com

Julie Lyrek

5

1.78896782E12 09/09/2026

This product is amazing!

[This review was collected as part of a promotion.] This product is amazing! Once a week I put this mask on, put on a shower hat. Then I let it "cook" for an hour or ? When I risnse it out, my hair is sooooo soft and silky. This really works!

Originaly posted on  kerastase-usa.com

Anonymous

5

1.788955239E12 09/09/2026

Heat Protector

[This review was collected as part of a promotion.] This stuff is great! Protects your hair but dont make it heavy or flat

Originaly posted on  kerastase-usa.com

Sheiff

5

1.78883821E12 07/09/2026

Amazing!

Such great texture and results! Highly recommend!!

Originaly posted on  kerastase-usa.com

Dlb2373

5

1.788813915E12 07/09/2026

Best Heat Protector

[This review was collected as part of a promotion.] Best heat protector out there. I use this every time I use my flat iron.

Originaly posted on  kerastase-usa.com

Carl M

1

1.788986807E12 09/09/2026

Just Okay

Made my hair dry, sticky and tangled. Irritated my scalp as spraying reaches the scalp too. Should be cream or lotion.

Originaly posted on  kerastase-usa.com

Reply from Consumer Care Center 09/09/2026

Hi there! We are so sorry to hear that the spray left your hair dry, sticky, and tangled, and that it caused scalp irritation. We completely appreciate your feedback suggesting that a cream or lotion format would be much better suited for application. If you would like help finding a rich, creamy treatment or leave-in lotion that keeps your hair smooth and manageable without the challenges of a spray, please feel free to reach out to our consumer care team or visit your local Kérastase salon!

Gi Tutunic

5

1.789002909E12 09/09/2026

Impress

[This review was collected as part of a promotion.] I absolutely love this product! It has made a noticeable difference in my fine, fragile hair, leaving it feeling stronger, softer, and healthier without weighing it down. My hair looks more full and has a beautiful shine after using it. And the smell is absolutely amazing—luxurious, fresh, and long-lasting! It makes my hair feel like I just left a high-end salon. Definitely one of my favorite Kérastase products and highly recommended! ✨💕

Originaly posted on  kerastase-usa.com

Anonymous

5

1.788886823E12 08/09/2026

Love !

[This review was collected as part of a promotion.] This product makes my hair so soft and silky . Moreover , it is a heat protector. I use flat iron in a regular basis.

Originaly posted on  kerastase-usa.com

JC_444

5

1.788984019E12 09/09/2026

Will buy it again

Love the scent and how well it’s been proven to protect against heat damage. Definitely recommend and will buy again.

Originaly posted on  kerastase-usa.com

ccb2702

5

1.788639315E12 05/09/2026

excellent heat protector

[This review was collected as part of a promotion.] I have been buying this product over & over again , non greasy , light weight , volume, heat protector all in one bottle ! go for it you will not regret!!!!!!

Originaly posted on  kerastase-usa.com

Lalagal

5

1.788569114E12 04/09/2026

Leave in spray

[This review was collected as part of a promotion.] Really liked this product. I use it to help protect & detangle my hair.

Originaly posted on  kerastase-usa.com

cezmontes

5

1.788482712E12 03/09/2026

Termique

Smells great and it does protects your hair I love it the only thing I would recommend kerastase is to make it I. Spray option or easier to put in your hair

Originaly posted on  kerastase-usa.com

Ashtan

5

1.788716721E12 06/09/2026

smells wonderful, leaves my hair very soft

This product is great for protecting my hair, extensions from the heat of hair tools. It smells wonderful and leaves my hair soft and shiny

Originaly posted on  kerastase-usa.com

JennyAnn

5

1.788542123E12 04/09/2026

Impressive Results

[This review was collected as part of a promotion.] I noticed a drastic improvement in my hair breakage in just a few uses! Super impressed!

Originaly posted on  kerastase-usa.com

Love God

5

1.788300726E12 01/09/2026

Excellent

Milky light beautiful smell makes my hair less frizzy

Originaly posted on  kerastase-usa.com

Tammy 361

5

1.788282027E12 01/09/2026

Best stuff ever

[This review was collected as part of a promotion.] This product saved my hair, my hair used to break all the time till I used this

Originaly posted on  kerastase-usa.com

Malibu 08

4

1.788445819E12 03/09/2026

Genesis Hair

I liked it! It helped my hair feel healthy & smooth.

Originaly posted on  kerastase-usa.com

Kawegn

5

1.788109219E12 30/08/2026

Great product!

[This review was collected as part of a promotion.] Love the feel and smell of this product. I can already tell a difference in the texture and smoothness of my hair.

Originaly posted on  kerastase-usa.com

Tris46

5

1.787864424E12 27/08/2026

Superb!

This product does what it is supposed to do and more. It smells great, protects my hair, stops heat damage before it starts, and leave my hair feeling soft and frizz free.

Originaly posted on  kerastase-usa.com

Bellmar

5

1.787845514E12 27/08/2026

Love

I love this! It’s lightweight and does the job! I use this along with the Elixir hair oil and I’ve noticed such a difference in the health of my hair.

Originaly posted on  kerastase-usa.com

Laura F

5

1.787829316E12 27/08/2026

Perfect product for my hair!

[This review was collected as part of a promotion.] My hair loves this product! Whether I am straightening it or letting it go curly, it’s soften and makes it look it look polished and shiny! Great scent too!

Originaly posted on  kerastase-usa.com

Dani12

5

1.787786111E12 26/08/2026

Love the outcome!

I love the outcome after use. It doesn't leave your hair oily. Its perfect

Originaly posted on  kerastase-usa.com

sherina

5

1.787557519E12 24/08/2026

Strengthen hair

[This review was collected as part of a promotion.] I felt it strengthen my hair and it’s an okay leave in which doesn’t weight it down.

Originaly posted on  kerastase-usa.com

CyndiNils

5

1.787522408E12 23/08/2026

Best detangler ever

[This review was collected as part of a promotion.] This product detangles your hair easy and leaves a nice parfum. Detangling and protecting, I wish I di

Originaly posted on  kerastase-usa.com

Cris Silva

5

1.787516115E12 23/08/2026

Perfect

This serum is so good. My hair really needs it because I always use heat styling—I can't go without my blow dryer. It truly makes my hair stronger. It gives amazing shine and smells absolutely incredible. I love it.

Originaly posted on  kerastase-usa.com

AdaSDo

4

1.787596217E12 24/08/2026

I love how this smells

This product smells amazing. I’m not crazy about it in terms of packaging I also feel it leaves residue in my hair but I love the smell

Originaly posted on  kerastase-usa.com

Bluegrassgal

5

1.787414416E12 22/08/2026

Soft and frizz free

Heavenly smell but most importantly leaves my hair healthy and frizz free. Southern heat is no match for this! I’ve been using these products for years and have never looked back.

Originaly posted on  kerastase-usa.com

laura22

3

1.787440036E12 22/08/2026

Didn’t notice a huge difference

Not a good match for my thin hair. Did not notice enough of a difference for the price.

Originaly posted on  kerastase-usa.com

Reply from Consumer Care Center 22/08/2026

Thank you for sharing your honest feedback with us. We completely understand your perspective—when you invest in a luxury Kérastase formula, you deserve a noticeable, high-performance transformation that makes every dollar feel completely worthwhile. Thin or fine hair requires a very delicate balance: it needs lightweight care that provides softness and shine without weighing down your natural lift or leaving any heavy residue. If a product is too rich, it simply won't deliver that airy, voluminous "wow" factor you are looking for. We would love to help you find an ultra-lightweight formula designed specifically for thin strands. Please feel free to reach out to our team at any time so we can guide you to your ideal match!

LeidyMun

5

1.786903217E12 16/08/2026

Smell delicious

Amazing heat protectant! It protects from heat up to 220°C, smells so luxurious, and actually helps with my hair fall. My hair feels stronger, less breakage when I brush, and super shiny after blow-drying. Not greasy or heavy at all. Love it!

Originaly posted on  kerastase-usa.com

NayNay62

5

1.786823123E12 15/08/2026

Favorite Product

[This review was collected as part of a promotion.] My favorite detangler and heat protector. I have very fine highlighted hair that tends to tangle and break off. Best product I’ve found to help with these issues. Also works great on detangling my granddaughter’s hair

Originaly posted on  kerastase-usa.com

Beth76

5

1.786769108E12 15/08/2026

Favorite!

This is probably my favorite Kérastase product! Cannot live without it!❤️❤️❤️

Originaly posted on  kerastase-usa.com

Anonymous

5

1.78700582E12 17/08/2026

I love it

[This review was collected as part of a promotion.] I makes my hair feel so protected when I use the straightener

Originaly posted on  kerastase-usa.com

rosey6

5

1.786734916E12 14/08/2026

Might be my favorite product

[This review was collected as part of a promotion.] I'm a huge believer in Kerastase products. The genesis collection has been amazing for my hair and this heat protectant is an essential part of my routine. Highly recommend any of their products but this one especially.

Originaly posted on  kerastase-usa.com

YessiR

5

1.786930208E12 16/08/2026

It a amazing product

[This review was collected as part of a promotion.] I’ve been using the Kérastase Genesis Heat Protectant for a few weeks, and I’m really impressed .It's perfect to take care of my hair that is long, straight and frizzy.It makes my hair softerThis product helps me with hair loss. Leaves a soft and delicate smell in the hair. It protects me from the strong heat of the iron 100 percent. Prevent my hair from breaking.I’ve noticed fewer split ends, less frizz, and softer, healthier hair since using the Kérastase Genesis Heat Protectant.it is super nourishing.

Originaly posted on  kerastase-usa.com

Rotemt

5

1.786649425E12 13/08/2026

Amazing Heat Protection for Soft, Smooth Hair

I love the Kérastase Genesis Défense Thermique! It feels lightweight, smells amazing, and leaves my hair soft, smooth, and easy to style without weighing it down. I especially love using it before blow-drying because it gives my hair heat protection while helping it look shiny, healthy, and less frizzy. A great addition to my hair routine!

Originaly posted on  kerastase-usa.com

Palora

5

1.78700582E12 17/08/2026

I am all for it

I really use this at any time even before bed it has changed my hair it shines I was scared because people said it was too heavy in the hair but it is not for me

Originaly posted on  kerastase-usa.com

Dandon

5

1.78658731E12 12/08/2026

In love with it

[This review was collected as part of a promotion.] Very goood it’s make my hair look smooth healthy nice

Originaly posted on  kerastase-usa.com

Anavaleria123

5

1.786452323E12 11/08/2026

AMAZING

The Best leave in so far, my hair felt so smooth and easy to style, will buy again!!!

Originaly posted on  kerastase-usa.com

Vanessa 321

5

1.786231838E12 08/08/2026

The best

I will never go back to any other brand this is the best

Originaly posted on  kerastase-usa.com

Ang22177

5

1.78596901E12 05/08/2026

Obsessed

I feel like I can’t live with out this one. It keeps my hair healthy and hydrated

Originaly posted on  kerastase-usa.com

Emily1088

5

1.785706211E12 02/08/2026

5/5 recommend

[This review was collected as part of a promotion.] This product smells great and works even better. I see less breakage and better hair health overall

Originaly posted on  kerastase-usa.com

Lisa718

5

1.78562161E12 01/08/2026

Keeps the flyaways tame

light weight for my fine hair, keeps flyaways away . Hair is shiny, smooth and smells great!

Originaly posted on  kerastase-usa.com

Pakita

5

1.785511822E12 31/07/2026

Love this!

[This review was collected as part of a promotion.] This heat protectant is characterized by its lightweight formulation, which ensures a flexible and residue-free finish. It delivers sustained performance and possesses a highly desirable fragrance. This product is my preferred choice.

Originaly posted on  kerastase-usa.com

Virg23

5

1.785813309E12 03/08/2026

Wonderful heat protectant spray

I really loved the heat protectant spray. My hair has never felt so good sfyer blowdrying

Originaly posted on  kerastase-usa.com

Jude88

5

1.785357014E12 29/07/2026

Protect my hair

[This review was collected as part of a promotion.] My hairdresser introduced me to this product and I love it

Originaly posted on  kerastase-usa.com

Meganlag

5

1.785349816E12 29/07/2026

Heat protectant

[This review was collected as part of a promotion.] Leaves my hair healthy and smelling so good love it so much

Originaly posted on  kerastase-usa.com

Avneet Kaur

5

1.785344436E12 29/07/2026

Amazing

It has been one of the amazing products i have used for my curls!

Originaly posted on  kerastase-usa.com

Yolandita

4

1.785197706E12 27/07/2026

I Love it!!!

[This review was collected as part of a promotion.] I love this product, one of my favorites I use this product after take a shower and gives me a soft hair

Originaly posted on  kerastase-usa.com

South37

5

1.785105906E12 26/07/2026

Best heat product for fine hair on the market

[This review was collected as part of a promotion.] My hair dries perfectly smooth and without any frizz. It also smells great!

Originaly posted on  kerastase-usa.com

Saruni

5

1.785024909E12 25/07/2026

Makes hair soft and easy to brush and untangle

This worked on day one. Together with the shampoo and conditioner reduced my chronic breakage

Originaly posted on  kerastase-usa.com

    Defense Thermique

    150ml

    Kerastase - Genesis

    Product code : 3474636857975

    Description

    Anti Hair-fall Fortifying blow-dry fluid for weakened hair, prone to falling due to breakage. Provides anti-breakage action and heat protection up to 220°C. Ensures optimal hydration without frizz.

    Read less

    To see prices, you must login or register.