“Wow what I have I even stumbled upon this stuff is AMAZING. I use it right before flat-ironing and sometimes on towel dried hair. No damage while flat-ironing now, and my hair stays silky for days. My stylist is all about conserving product and she taught me how to use this so that the bottle (though small) will still last me months. Adore this product. I also love the dual pump dispenser. Knowing that I'm getting two very active ingredients to treat my hair is great. ”

“Fibre Architecte Serum is fantastic! I am always willing to try products that will help me keep my hair straight. I use it every day just before I flat iron. Another life- changing product!”

“I must admit I was pouting after Kerastase discontinued their Substance Constructive conditioner. What a cry baby I am! This NEW product is divine! The SECOND I put it on my hair it spread like wildfire and my hair felt brand new before I even dried it. THANK YOU Kerastase. My only regret is that I didn't try it sooner. ”

“My hair has become increasingly dry, brittle & was breaking off at the ends!!! I've been highlighting my hair as well as flat ironing it every other day. Nothing I used seemed to help with the split ends & dryness, so I decided to stop highlighting for a couple of months. I read about fibre architecte in a magazine...a model was reccommending it since her hair goes through a lot of abuse. What a difference in my hair & the split ends in just a week!!!!! I also bought the Bain de force shampoo & masque that I use every other day. I can't rave enough about how much of an improvement they have made to my hair. I now can go back to highlighting my hair without worrying about the breakage & split ends!! Thanks for a great product...I only wish the bottles came in a larger size!!!”

“I have used this product for the last 2 months and it has really imrpoved the texture and strength of my hair. I truly feel it is adding strength to my extremely broken brittle hair each time I use it.”

“I live in the northeast, where the winters are extremely dry, and to add to this, I have hard water. My hair has always been extremely dry and fragile since I moved to NE. Since I started using Fibre Architecte in combination with the Chroma Thermique, my hair has gotten much healthier! Even my stylist has noticed the difference. He says my hair no longer feels like I've taken up swimming in chlorinated water every day!”

“I love this stuff - not only does it smell delicious but it makes my hair feel super soft and look substantially healthier than what it really is. ”

“This product completely smooths out my hair so the breakage is less noticeable. I am a high lift blond to protection is key. This product does the trick.”

“I have been using this product for about two weeks. I love it! I have been using the product when my hair is when and then blow drying it. I have no more frizzy. My hair is very fine, so I only use very little. This is a must have!”

“This product has completely changed the texture of my hair. It's like a force field around each strand! It's incredible! I can't live without it. I put it on about half way thru my blow out (as I transform my wavy frizzy hair into straight hair) , finish the blow out then straighten and my hair looks like and feels like silk! I'm in love!”

“I have literally spent thousands on my hair in my lifetime on products and nothing has compared to Fibre Architecte. I noticed a difference the very first time I used it, which is a first!Not to mention it smells so good too! After drying my hair I place a nickel size in my hands and rub together to emulsify and then disburse thru the length ends of my hair paying special attention to the ends and then I flatiron.My hair looks like I left the salon every morning when I leave the house. It is a miracle drug for my hair. I hated spending the money at first but I completely did NOT think about that after the first use. And with using so little, it will last a while. Money well spent and am FINALLY in love with my hair! Don't hesitate, this is a no-brainer ladies!”

“Let me start off by saying that i've never written a review before, even though I rely heavily on others' reviews. With that said, I felt it necessary to write one regarding these products because I feel very strongly about them. My mom works in a salon and I have used quality salon products on my hair all of my life. Now, in my late 20's, I started experiencing some problems with my hair that products I used in the past were no longer able to correct. I used to heavily highlight my hair and about a year ago decided to go darker which is closer to my natural color. In addition, I moved to New Mexico which is a very dry climate. I noticed my hair gradually getting dryer and breaking very badly. This, of course, was very upsetting. I couldn't understand how my hair could be in such horrible shape when I thought I was taking such good care of it. My stylist reccomended Kerastase to me. Let me add that this was a product that wasn't even sold in her salon!! I decided to try it. I started using Bain de force, ciment usure, and fibre architect and noticed a difference after ONE use!!! These products are amazing and I would reccomended them to everyone! Well worth the money, I plan on buying the masque and ciment thermique ASAP! If your hair is in distress, this is exactly what you need. My hair feels light, healthy, and beautiful again! ”

“Perfect product for sealing dry split ends together. I love using it with flat irons and curling irons. Leaves the hair with a beautiful texture.”

“I have always used Kérastase, this was the first time using Fibre Architecte, This product is amazing. After blow drying before straighting I applied this product to my hair from the second I put it on it was like magic. My hair was like silk. Gave my hair a whole new life. Looks like I just walked out of a Salon. Makes my hair smooth and shiny. Very light weight, the best part is i don't feel like I have to wash my hair as often. Wish the price was a little lower, or larger size for the price. ”

“Used at my salon before it was available to the public and I fell in love immediately. My hair is more manageable, shiny, and healthy looking. The product is a must have. Would highly recommend for any hair type.”

“Excellent product.The only downside for me is the price.i have very long hair and i use the flat iron every day.I would go through a bottle in little more than a week. Other than that i feel like this is the product that i can't live without anymore.”

“I HAVE TRIED MANY KERASTASE PRODUCTS AND MOST OF THE TIME I WAS JUST LIKE OK ITS GOOD BUT NOT SOMETHING I WOULD BUY AGAIN. THIS FIBRE ARCHITECTE IS THE BEST HAIR PRODUCT THAT I HAVE EVER USED. NO LIE. IT LEAVES MY HAIR SUPER SHINY AND REPAIRED. YOU ONLY NEED TO USED THE SMALLEST AMOUNT IN YOUR HAIR TOO. I WASHED MY HAIR CONDITIONED IT AND LEFT IT IN MY HAIR WET. I WENT TO SLEEP AND WOKE UP AND WASHED MY HAIR AGAIN AND PUT THIS IN WET AND BLOW DRYED MY HAIR AND IT CAME OUT GORGEOUS. I DON'T NEED TO FLAT IRON OR ANYTHING. I DRYED MY HAIR WITH A ROUND BRUSH AND VOILA MY HAIR JUST SOFT AND MANAGEABLE. I READ MANY REVIEWS ON THIS BEFORE I PURCHASED IT BUT I AM CERTAINLY GLAD THAT I FOUND THIS. I HOPE THEY KEEP THIS PRODUCT A PERMANENT PART OF THE LINE AND ADD SOME MORE STUFF TO THIS PARTICULAR LINE. YOU DEF HAVE A DEVOTED FAN. THANKS KERASTASE. LOVING IT. ”

“Excellent product.It makes my hair soft and shiny.The only downside is the price.My hair is very long and i go throuugh a bottle in one week.It is quite pricey for me but i feel that i can't live without it anymore.I'm hoping for promotions so i could buy more.”

“My hair feels amazing. I didn't think it was possible. I love that when I don't feel like washing my hair, I can use fibre and flat iron it and it still looks great. ”

“Both my granddaughter and I have dry, curly and sometimes frizzy hair, we were both thrilled with the results. Hair like silk, glisting and as smooth as it can be. A fantastic development by Kerastase. Thank you!! ”

“i love this serum - really light weight, but smooth's my ends;) ”

“This is my new "must have" product from Kerastase.”

“This product is amazing! I've used it 3 times and can definately see the difference it makes. Finally a product that really repairs split ends.”

“Wonderful product to add shine and strength to dry sensitized hair! ”

“I swim everyday and my untamable frizzy hair and lack of blowdrying skills left me walking around like a madwoman. In my desperation to do something about my hair, I watched the show on youtube with the model, and decided that if FIBRE ARCHITECHTE could fix that model's hair problems, it could fix mine. I followed the instructions when the product arrived, applying it to dry hair and afterwards sealing the product with the flat iron. Ten minutes later, when my husband met me in the city, he told me he almost fell off his chair. He said he couldn't understand how I had had time to go to the salon for a blow out. Yes, the product's price might be steep, but the ROI is high. I put in forty two dollars, and now look like a million! ;)”