Kerastase

Kerastase Genesis Defense Thermique Blow Dry Primer.

Haircare

About this product

A heat-protection primer spray designed to prepare hair before blow-drying, infused with antioxidants and a moisture-locking complex.

Guru Score

84%

Yay

Early verdict · Few reviews so far

What they liked

Lightweight but adds moisture and shine
Reduces breakage and heat damage
Does not weigh hair down

What they flagged

Nothing. None of the experts who reviewed it raised a problem.

What the gurus are saying

This heat protectant earns consistent praise for its antioxidant-rich native cells and moisture-locking complex that smooths and softens the hair cuticle. Gurus count it among their favorite heat protectants, and note it has a pleasant scent. With only a couple of takes in so far, there is not much comparative perspective yet, but what gurus have shared points solidly positive.

Synthesized from 2 expert reviews · most recent take April 2025

Type

HaircareSpray & mist

Where to buy

Sephora → Amazon → Google →

Opens a store search. We may earn from these links.

Scan it in the shopFree iPhone app. Scores in the aisle.

What the gurus are saying.

Every take we've logged from this product's reviews across YouTube. Click any row to watch the moment they said it.

All takes Yay takes Nay takes Mixed takes Hide sponsored

Tea with MD

115k subs

✓Yay

"It has edetoise native cells which are really rich in antioxidants, [...] and it also has this Aqua Oolium complex which helps to lock in moisture while smoothing and softening your cuticle. This is an incredible product. It smells really good, too."

Dr. Jenny Liu

323k subs

✓Yay

"One that I absolutely love, one of my favorite heat protectants of all times, again from Kerastase, and it's their Genesis line, their Defense Thermique. This is a leave-in conditioner, lightweight, but at the same time helps to reduce breakage and offers heat and UV protection. Their whole Genesis line is really meant for individuals that experience hair fall due to breakage. I really love their shampoos and conditioners, but really this is the one that I use the most."

Frequently asked.

What is Kerastase Genesis Defense Thermique Blow Dry Primer?

A heat-protection primer spray designed to prepare hair before blow-drying, infused with antioxidants and a moisture-locking complex.

Is Kerastase Genesis Defense Thermique Blow Dry Primer worth it?

Yes. All 2 gurus who reviewed it give it their stamp of approval, for a Guru Score of 84%.

What is Kerastase Genesis Defense Thermique Blow Dry Primer's Guru Score?

Kerastase Genesis Defense Thermique Blow Dry Primer holds a Guru Score of 84%. That is our read on how warmly the experts talk about it, based on the verdicts of 2 expert reviewers we have collected.