Main content
Go to Great Lengths

Go to Great Lengths

Introducing Résistance Extentioniste. A new family of hair care products
focused on keeping hair strong and healthy, so it can grow as long as you
like, always looking shiny and gorgeous.


At some point in her life, every woman has wanted long, luxurious hair. The kind that moves with you,
that cascades to your shoulders and beyond. down, down, down. The hair of a modern
mermaid, armed with feminine power and fascinating secrets. A never-ending halo of gorgeousness.


It’s just that, whenever you try to grow your hair out, you run into problems. Breakage and damage, dryness and dullness. As hair grows longer, it simply spends more time in the world, exposed to the environmental pollutants and styling and chemical stresses.



As it approaches the desired length, hair begins to look...not its best. Reluctantly, you ask your stylist to cut a bit more than you would’ve liked. You tell yourself it’s for the health of your hair. It feels like it’s one step up, two steps back, always. You never quite reach your goal length.





No more of this, we say.


The hair scientists at Kérastase are aware of the difficulties of the growth process. We know that it requires
willpower and dedication, a focused regimen that produces the strength and stamina hair needs
to go the extra mile. You need the right tools and techniques to get the results you want.




It’s a new family of products focused on keeping each strand strong and healthy, so hair can grow as long as you like, looking glossy and gorgeous all the while. No more too-generous trims and a-little-too-short styles.



As it approaches the desired length, hair begins to look...not its best. Reluctantly, you ask your stylist to cut a bit more than you would’ve liked. You tell yourself it’s for the health of your hair. It feels like it’s one step up, two steps back, always. You never quite reach your goal length.See your stylist right away to jumpstart your long-hair training program with Protocole Extentioniste, a boost for your hair goals. Your stylist can also recommend an at-home Extentioniste hair training to keep you on track between visits.






With exceptional care and a little patience, you can achieve long, healthy, incredible hair,
and keep it that way until you decide it’s time to cut it. Which might be never. Who can predict?






Extentioniste Hair Care Routine

The Extentioniste routine targets roots, lengths and ends. It stimulates the scalp,
then gently detangles lengths while reinforcing and finally sealing ends for hair
that is as full and strong at the tips as it is at the root. Finish with the thermique
and your hair is fortified with no split ends and no breakage.






Discover Related Articles

Discover how we combine our deep knowledge of hairdressers and their clients to imagine a world of hair care products that would exceed expectations

10 Reasons To Love Elixir Ultime Hair Oil

10 Reasons To Love Elixir Ultime Hair Oil

It’s been a decade of iconic shine. Let’s celebrate the luxurious hair oil’s tenth
anniversary by counting the ways we love this gleam-inducing liquid gold.
The Secret Weapon For Healthy, Long Hair

The Secret Weapon For Healthy, Long Hair

So you want stronger, longer hair, but you’re addicted to the blow dryer.
Not a problem. Now Extentioniste Thermique blow dry primer protects
hair up to 450°F with 90% less breakage* after 1 application, so you can
feel free to style away. Your hair stays strong while it grows long. Voila!
(*vs. non-conditioning shampoo).
What Kind of Blonde Are You?

What Kind of Blonde Are You?

There are as many types of blondes as there are women in the world. Some keep it subtle, others want all the drama. We’ve identified six iconic levels of blonde along the spectrum—with Blond Absolu routines to match. What kind of blonde are you?
The Exceptional Anti-Aging Ritual For Scalp and Hair

The Exceptional Anti-Aging Ritual For Scalp and Hair

Experience this 20-minute, 6 step in-salon hair treatment for total
scalp relaxation and revitalize aging hair.


Find Your Nearest Salon

Far more than the place to get your root touch-up or an occasional trim, book an appointment at your nearest Kérastase salon for a complimentary personalized hair diagnosis.


Find a Salon


Services Your Personal Care





Fusio-Dose In Salon

Learn about the signature in-salon service that transforms
hair quality in under 5 minutes.


Learn More


The Right Products for You

Take the online hair diagnostic to find the best hair care
and treatment mix for your hair.


Start Now






Sign Up For Email

Sign up and enjoy 15% off your first order.

Your Benefits

  • Access exclusive offers
  • Shop new products first
  • Receive personalized hair care recommendations
  • Enjoy coveted stylist tips
  • Follow the latest hair care trends
Orientation message
For the best experience, please turn your device