Editor's TipEditor's Tip

To fortify and repair hair further, cleanse with Kérastase Bain Force Architecte.

Kérastase

Birchbox Breakdown

Heat styling and coloring our hair is a bit like eating a bag of Cheetos: We know we’ll need to work hard to counteract the effects later. This ultrahumectant hair masque fortifies weakened strands in 15 minutes or less. Think of it as a cardio circuit plus strength training session for your hair. Now, go wash the orange dust off your hands.

How it Works

A patented combination of fibrous strengtheners, molecular technology, and proteins repair weakened strands from within. Ceramides coat each piece of hair to combat external breakage and soothe the cuticle.

How to Use

Apply a quarter-sized dollop to hair from mid-lengths to ends. Leave on for 10-15 minutes and rinse thoroughly.

More for You!
  • Free returns within 90 days of purchase
  • Extra samples and gifts in the Bonus Shop

Product Reviews & Sample Feedback

16 Reviews
4.7 out of 5 stars
5 Star
13
4 Star
1
3 Star
2
2 Star
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1 Star
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Most Helpful Customer Reviews

Very Heavy
Purchased

My hair is curly and very frizzy plus I live by the beach so I have to deal with humidity almost every day. Because of this, I like a pretty heavy conditioner like Kerastase makes. I've been using the orange line of Kerastase products for years and love how soft it makes my hair, but with fading color and breakage, I switched to this. My hair seems to be doing better with less color fade and fewer split ends. However, this product has almost a waxy feel in my hair that I can't seem to wash out and it doesn't detangle into silky smoothness like their other products. I like the damage repair enough to keep using it, but the feel of the product is such that it's probably not something I would purchase regularly.

3
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Best Conditioning Treatment for Damaged Hair
Purchased

I have long blonde hair, and this stuff is a lifesaver! I've used it for a few years now and noticed my hair had less breakage and split ends. Ideal if you color your hair or use heat styling tools on a daily basis.

5
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Amazing
Purchased

My hair is super damaged from continuous highlight processing and bleach. This mask rescued my hair. It smells great, but I also really saw a difference in my hair. You get what you pay for on this one. Only one use and I saw a dramatic increase in strength to my hair and fewer split ends. My hair was soft and no longer felt like straw. Its truly an amazing product, and I can't stress enough how much I love it. You can use Bumble and Bumble, Oribe, Alterna...etc, but no other luxury/high end line can compare.

5
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Great masque!
Purchased

This is a very concentrated product. You don't need much of it. I only leave it on for about 5 minutes but the benefits last through to the next day. Highly recommend.

5
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Great for Damaged Hair
Purchased

If your hair has been over processed, you need this conditioning treatment. I know this brand is pricey, but it's worth it.

5
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Really Moisturizing
Purchased

I really am happy with this mask, but I have to say it is not as heavy duty on the ends of my hair as I needed it to be and it does seem to leave the top of my head a little greasy looking, even though I take the extra effort not to put it directly near my roots.

4
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Best hair masque!

I have been searching for a masque like this for years! I can't tell you how silk and soft my hair feels after I use this! It adds shine to my hair while repairing split ends! After I use this product my hair is so soft I dont even have to use a detangler! AMAZING PRODUCT

5
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Amaze me.

I'm amazed every time. I notices dramatic results with this used with the shampoo of the same name. I have had much less breakage. It's a pretty penny, but...well, so are you!

5
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Masque Treatment
Purchased

This brought my hair back to life! My hair was so dry and dead from this harsh winter, my next option was just to cut it. I used this once and my hair looked fresh, my ends weren't dry and it felt so soft and lucious. It is a little pricey but if you hair is in need of some serious love it is well worth the investment!!

5
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Great for damaged and dry hair

This mask is definitely a splurge, but if your hair is incredibly damaged and dry, it's so worth it. I recently had to cut off 2+ inches of split and damaged ends and my stylist recommended this to me to help keep the damage at bay while I continue to grow my hair. It's super thick and feels + smells awesome. I usually focus it on my ends and let them soak it up while I shower - it's also awesome as an overnight mask! Keeps my ends feeling hydrated and makes the rest of my hair soft and shiny.

5
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