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Side by side

Kerastase Genesis Defense Thermique Blow Dry Primer vs Kerastase Resistance Ciment Thermique

53% function match · 4 of the 10 functions we compared match Formula overlap 6%. Kerastase Genesis Defense Thermique Blow Dry Primer and Kerastase Resistance Ciment Thermique share 4 ingredients among each other's most prominent.

Based on your consultation

Which of these fits your hair?

We check your pattern, moisture need, scalp, fragrance tolerance, weight sensitivity and more against each formula — and say which one lines up.

Your profile at a glance

  • Your answers appear here
  • Your answers appear here
  • Your answers appear here
  • Your answers appear here

When each one is the right call

What each formula is built for, from its own ingredient list.

  • Genesis Defense Thermique Blow Dry Primer — heat styling
  • Resistance Ciment Thermique — dry, thirsty hair

Side by side

Every trait, aligned

One row per trait, read from each product’s own ingredient list and record. A dash means we have not researched that field for that product — it is not a “no”.

Trait
Kerastase Genesis Defense Thermique Blow Dry Primer — 5.1 oz container Kerastase

Genesis Defense Thermique Blow Dry Primer

  • Heat protectant
  • Prestige
  • Sulfate-free
  • Moisture-rich
Kerastase Resistance Ciment Thermique — 5.1 oz container Kerastase

Resistance Ciment Thermique

  • Heat protectant
  • Prestige
  • Sulfate-free
  • Moisture-rich
Price, size & price per ounce
$50 5.1 oz · $9.80/oz
$52 5.1 oz · $10.20/oz
Value / price positioning
Same job for less elsewhere $$$$$ Prestige tier · costs more than 94% of the 553 heat protectants we’ve priced
Same job for less elsewhere $$$$$ Prestige tier · costs more than 91% of the 223 heat protectants we’ve priced
Best for hair types
Curly–Coily A heavy formula: coarse, curlier strands carry it without flattening. Your hair
Straight–Curly Smoothing and thermal products span straight through curly hair. Your hair
Moisture level Differs
Moderate Humectants in the working part of the formula. Your hair
High Humectants near the top — water-binding is a headline mechanism here. Your hair
Heat protection
Moderate Sold as a heat protectant; no temperature is stated. Your hair
—
Slip / detangling Differs
High Conditioning agents sit high in the list — this is a detangling formula. Your hair
Moderate Conditioning agents are present, lower in the list. Your hair
Weight on hair Differs
Rich Heavy butters and waxes in the first eight ingredients. Your hair
Light Water-first and light: unlikely to flatten fine hair. Your hair
Fragrance
Present Fragrance is listed; it sits below the working ingredients. Your hair
Present Fragrance is listed; it sits below the working ingredients. Your hair
Protein Same
Minor Protein appears, low enough to be a supporting ingredient. Your hair
Minor Protein appears, low enough to be a supporting ingredient. Your hair
Silicone / wax buildup Same
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
Clarifying wash needed
Moderate Your hair
Moderate Your hair
Oils and butters Differs
—
None No oils or butters in the list. Your hair
Fast-drying alcohol Differs
Present Fast-drying alcohol is present — it speeds drying and can read dry on the hair. Your hair
None No fast-drying alcohol in the list. Your hair
Formula completeness
out of 10
Complete for its job
out of 10
Complete for its job
Who should choose this
  • Heat stylingthe brand positions this as a heat protectant
  • Maximum slipfor hair that tangles the moment it is wet
  • Dry, thirsty hairhumectants and emollients both sit up front
  • Coarse or dry hairthat absorbs everything you give it
  • Dry, thirsty hairhumectants and emollients both sit up front
  • Fine hairthat flattens under most products
  • Porous, damaged hairceramides are in the list
  • Very dry hairno fast-drying alcohol in the list
Why you might skip it
  • Scents bother youthis product carries a strong scent
  • Curly-method routinesthese silicones need a detergent to remove
  • Oily scalp or fine hairthat gets weighed down
  • Scents bother youthis product carries a scent
  • Curly-method routinesthese silicones need a detergent to remove
  • Dry or very humid airwhere heavy humectants work against you
from the formula stated by the brand reported by reviewers Scale: 1 dot low · 5 dots high, within this product type.
More facts about each one
Type
Heat protectantspray
Heat protectantcream
Where to buy
Brand website · Target · Amazon
Specialty beauty · Salons · Brand website
Free of
  • sulfate-free
  • sulfate-free
Cruelty-free
Not cruelty-free · PETA-listed
Not cruelty-free · PETA-listed
Scent
Scented, not described
Scented, not described
Heat protection
Claimed, no temperature stated
—

Facts as we recorded them. A dash means we have not researched that field for that product — it is not a "no".

The bottom line

The bottom line depends on your hair

Which of these two suits you is a question about your hair, not about them. The consultation answers it — and tells you what your routine needs around it.

Take the consultation

$49.00 once, for your consultation and hair profile. No subscription, no required purchases.

The detail behind the table

Where the readings above come from: the ingredient lists themselves, each brand’s claims checked against them, what owners report, and cost per ounce in context.

Shared and distinct ingredients

Shared and distinct ingredients

Computed from the ingredient lists as printed. "Shared" means both lists carry it; where it sits on each label is stated, because position is what tells you how much.

What both formulas carry

IngredientGenesis Defense Thermique Blow Dry PrimerResistance Ciment Thermique
Water
Neutral
#1Leading
#1Leading
Amodimethicone
Buildup
#3Leading
#15Below the 1% line
Phenoxyethanol
Stabilizes
#5Below the 1% line
#6Below the 1% line
Limonene
Fragrance
#15Below the 1% line
#14Below the 1% line
Linalool
Fragrance
#19Below the 1% line
#23Below the 1% line

What only one of them carries

Genesis Defense Thermique Blow Dry Primer

Resistance Ciment Thermique

Full ingredient list — Genesis Defense Thermique Blow Dry Primer (37)
Full ingredient list — Resistance Ciment Thermique (31)

Claims check

What each brand says, against what each formula shows

Claims are quoted from each brand. We only mark one supported, partly supported, or conflicting when that product’s ingredient list actually speaks to it.

VerdictsGenesis Defense Thermique Blow Dry PrimerResistance Ciment Thermique
Supported
1
0
Partly supported
2
1
Stated by brand
3
3
Potential conflict
0
0

Genesis Defense Thermique Blow Dry Primer

  • Lightweight leave-in spray to strengthen, heat protect, and prevent breakagePartly supportedSupports the surface, not a treatment.
  • 97% less hair fall due to breakage from brushingStated by brandOnly the brand’s testing shows this.
  • 89% more nourished hairStated by brandOnly the brand’s testing shows this.
  • 88% more smooth/conditionedStated by brandOnly the brand’s testing shows this.
  • Strengthens Hair Weakened from Brushing and Over-StylingPartly supportedSupports the surface, not a treatment.
  • Up to 24 Hours of Frizz ProtectionSupportedSmoother strands, less frizz.

Resistance Ciment Thermique

  • Strengthening Blow-Dry Cream for Damaged HairPartly supportedSupports the surface, not a treatment.
  • instantly reconstructs, reinforces and resurfaces the hair fiberStated by brandCan’t be confirmed from label.
  • recreates the hair's natural external protective layerStated by brandCan’t be confirmed from label.
  • makes the blow-dry two times fasterStated by brandCan’t be confirmed from label.

What owners say

What people report

Recurring themes our researchers wrote in their own words from sourced reviews. We do not store or scrape star ratings, and we never balance one product’s themes against another’s by inventing them.

Both praised for moisture.

Genesis Defense Thermique Blow Dry Primer

Hair feels softer, more hydrated, and less frizzy after use

Adopted as a must-use step before blow drying or straightening

Pleasant, long-lasting scent; texture described as lightweight, not heavy or greasy

Frequently noted as expensive, though most say worth it for the results

Resistance Ciment Thermique

Reviewers describe hair that is soft, shiny and smooth after a blow-dry and call it their go-to heat protectant, with fine-but-thick hair saying a quarter-sized amount is enough.

frequent heat stylers, fine and medium hair

A minority say it did nothing for smoothing or protection on very fine hair, and a few report hair feeling stiff or 'like straw', several of them questioning whether the unit was genuine.

very fine hair, curly hair; the critical-review tail

Salon-quality users rate it good rather than miraculous: it works, but some who were influenced to buy it found it no better than what they already used.

reviewers who use only salon products

The fruity scent is loved by some as tropical passion fruit and pear and disliked by others as childish or grapefruit-like, and a repeat buyer says the fragrance was recently changed.

general reviewers, one long-term repeat buyer

Price check

Cost per ounce, in context

Cost per ounce against every product of this type we have priced, each at the size it is most often sold in. Value labels are computed from that percentile and from how many products that do the same job cost less; they are comparisons, not judgements about a brand.

$9.80/oz vs $10.20/oz — within about the same cost per ounce.

$0.01/oz median $2.46/oz $76.00/oz $9.80/oz Genesis Defense Thermique $10.20/oz Resistance Ciment Thermiqu

Every mark sits on one distribution because these are compared against the same set: 553 heat protectants with a computable unit price.

Value readGenesis Defense Thermique Blow Dry PrimerResistance Ciment Thermique
Label
Same job for less elsewhereYou are paying above the range for a formula close to several lower-priced options.
Same job for less elsewhereYou are paying above the range for a formula close to several lower-priced options.

Computed from cost per ounce against every product of this type we have priced, and from how many products that do the same job cost less. It is a comparison, not a judgement about the brand.

Compare with something else

Close formulas to each of these, as their own comparison pages.

Genesis Defense Thermique Blow Dry Primer vs Pureology Color Fanatic Multi-Tasking Leave-In Conditioner SprayPureology · 90% function matchResistance Ciment Thermique vs Resistance Heat Protectant Leave-In Styling Cream for Damaged HairKerastase · 100% function matchGenesis Defense Thermique Blow Dry Primer vs Bond Rx Leave-In TreatmentPaul Mitchell · 90% function matchResistance Ciment Thermique vs Nutritive Nectar Thermique Beautifying Anti-frizz Blow Dry MilkKerastase · 90% function matchGenesis Defense Thermique Blow Dry Primer vs Blond Absolu Blonde Guard Hydrating Leave-In Conditioner Spray with Hyaluronic AcidKerastase · 88% function matchResistance Ciment Thermique vs Nutritive Nectar Thermique Heat Protecting CreamKerastase · 90% function matchGenesis Defense Thermique Blow Dry Primer vs Shea Pro Leave-in MoisturizerAphogee · 87% function matchResistance Ciment Thermique vs All Eyes On Me 10-in-1 Hair Perfector Detangling Leave-inNot Your Mother's · 88% function match

Genesis Defense Thermique Blow Dry Primer · Resistance Ciment Thermique · All heat protectants in the library

How this page was made

  • This page is assembled from the same researched records the individual product pages render: identity, each ingredient list as printed, each brand's own claims, dated price observations, and review themes written in our researchers' own words. Nothing on it is written per comparison.
  • We do not rank these against each other. Which of them suits you depends on your hair, and that is what the consultation works out.
  • The formula similarity percentage is a stored, precomputed number: position-weighted overlap of the two ingredient lists blended with agreement on the attributes we derive. It measures how alike two formulas are, not how well either works.
  • The value band is a fixed label over two stored numbers: this product’s cost per ounce as a percentile of every product of this type we have priced, each at the size it is most often sold in, and how many products we score as doing the same job cost at least a quarter less per ounce.
  • The "Is this right for you?" panel reads only your own consultation answers, and it applies exactly the filters our recommendation engine applies. It is computed when you load the page and is never stored on it.
  • 10 sources were consulted across the products on this page.
  • Ingredient order tells you relative amount only above roughly 1%. Prices are observations on the dates shown and change without notice. We do not sell these products and take no placement fees.
  • This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.

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