I have long, very dry, damaged hair from heavy bleach highlights with high lift color in between, and I blow dry and flat iron daily. Ciment Thermique is what is actually recommended for my hair type, but I have been a fan of Kérastase Nectar Thermique along with a silicone serum (my favorites are Oscar Blandi Jasmine Oil and Shu Uemura Essence Absolue) to protect my hair from the excessive heat styling abuse I subject it to. Ciment was not much better than putting water into my hair, but Nectar Themique gave me some additional much needed softness and shine.
I got a sample of Keratine Thermique with one of my Kérastase orders and I was skeptical to try it since I loved Nectar Thermique so much. Also it contains a small amount of protein and my hair doesn't generally like protein in leave-in products- it tends to leave my hair dry and crunchy. It's marketed towards frizzy hair and my hair isn't terribly frizzy. However, I decided to try it anyway, and I was absolutely blown away!!!
Keratine Thermique did everything Nectar Thermique did for my hair and more! My blow dry time was cut down drastically, and my hair felt so soft, and looked so unbelievably smooth, silky and glossy. Even my unruly, "dead" looking ends looked smooth, shiny and healthy. People have even commented on how much healthier my hair looks. I immediately purchased a full-size tube. This product really helps shield hair from humidity as well- a must if you live in a humid climate or go on vacation. It smells amazing too. I love it so much I decided to buy the Bain Fluidealiste and Maskeratine from the Discipline line as well, which are also amazing.