The Kérastase Genesis Défense Thermique isn’t just a heat protectant — it’s hair armor. I spray it on before blow-drying or straightening, and my hair looks like glass — smooth, frizz-free, and so soft I can’t stop touching it. It smells absolutely divine (that signature Kérastase scent that lasts all day 😍) and doesn’t leave any stickiness or residue. My ends used to look fried after heat styling, but now they stay healthy and shiny — like I just walked out of a salon. It’s lightweight, nourishing, and seriously protective — my hair feels stronger with every use. Whether you use heat daily or just occasionally, this spray is a must-have in your routine. Read more
I love this thermal protector from Kérastase. Leaves the hair super soft, manageable and with a beautiful shine without leaving it heavy. It protects very well from heat and helps reduce breakage, especially if you use an iron or dryer. It smells delicious and the quality is noticeable from the first use. Highly recommended. Read more
Has a wonderful smell. A small amount goes a long way and it’s really helping my hair stay healthier. Read more
Wonderful product - instantly allows my long hair to de tangle and be combed easily Read more
If you regularly use hot tools on your hair this thermal spray is an absolute must. It works great as a detangler right out of the shower and smells AMAZING! Read more
My hair was very damaged and brittle, but from the very first application of Kérastase Genesis Défense Thermique, I noticed an incredible change. It’s now softer, more manageable, and protected from heat. Highly recommended for weak and damaged hair!🥰🥰🥰 Read more
This blow dry primer leaves my hair feeling soft, smooth, and way less frizzy. It also does a great job protecting from heat and detangling. But the spray nozzle isn’t great, it’s hard to control and sometimes sprays unevenly, which can be annoying. Read more
This leaves my hair smooth, shiny, and much less frizzy, even in the PNW. It’s pricier than I think it should be, but it does a great job. Read more
