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Side by side

Kerastase Discipline Fluidissime Thermique Heat Protecting Spray vs Kerastase Genesis Defense Thermique Blow Dry Primer

71% function match · 6 of the 10 functions we compared match Formula overlap 50%. Kerastase Discipline Fluidissime Thermique Heat Protecting Spray and Kerastase Genesis Defense Thermique Blow Dry Primer 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.

  • Discipline Fluidissime Thermique Heat Protecting Spray — heat styling
  • Genesis Defense Thermique Blow Dry Primer — heat styling

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

Discipline Fluidissime Thermique Heat Protecting Spray

  • Heat protectant
  • Prestige
  • Sulfate-free
  • Moisture-rich
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
Price, size & price per ounce
$50 5.1 oz · $9.80/oz
$50 5.1 oz · $9.80/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 94% of the 553 heat protectants we’ve priced
Best for hair types
Straight–Curly Smoothing and thermal products span straight through curly hair. Your hair
Curly–Coily A heavy formula: coarse, curlier strands carry it without flattening. Your hair
Moisture level Same
Moderate Humectants in the working part of the formula. Your hair
Moderate Humectants in the working part of the formula. Your hair
Heat protection
High The brand states a protection temperature — a label claim, not a measurement. Your hair
Moderate Sold as a heat protectant; no temperature is stated. Your hair
Slip / detangling Same
High Conditioning agents sit high in the list — this is a detangling formula. Your hair
High Conditioning agents sit high in the list — this is a detangling formula. Your hair
Weight on hair Differs
Medium Middle of the range — noticeable on fine hair, light on coarse hair. Your hair
Rich Heavy butters and waxes in the first eight ingredients. 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
Fast-drying alcohol Differs
None No fast-drying alcohol in the list. Your hair
Present Fast-drying alcohol is present — it speeds drying and can read dry on the hair. 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 states protection to 450°F
  • Maximum slipfor hair that tangles the moment it is wet
  • Dry, thirsty hairhumectants and emollients both sit up front
  • Porous, damaged hairceramides are in the list
  • 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
Why you might skip it
  • Scents bother youthis product carries a scent
  • Curly-method routinesthese silicones need a detergent to remove
  • Vegan and cruelty-freeour record does not support both claims here
  • 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
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 protectantspray
Where to buy
Brand website
Brand website · Target · Amazon
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
up to 450°F
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

IngredientDiscipline Fluidissime Thermique Heat Protecting SprayGenesis Defense Thermique Blow Dry Primer
Water
Neutral
#1Leading
#1Leading
Amodimethicone
Buildup
#2Leading
#3Leading
Polyquaternium-37
Detangles
#5Supporting
#4Supporting
Propylene Glycol Dicaprylate/Dicaprate
Softens
#6Supporting
#6Below the 1% line
Glycerin
Moisturizes
#7Supporting
#22Below the 1% line
Benzyl Salicylate
Fragrance
#14Below the 1% line
#24Below the 1% line
Linalool
Fragrance
#22Below the 1% line
#19Below the 1% line
Phenoxyethanol
Stabilizes
#10Below the 1% line
#5Below the 1% line

What only one of them carries

Discipline Fluidissime Thermique Heat Protecting Spray

Genesis Defense Thermique Blow Dry Primer

Full ingredient list — Discipline Fluidissime Thermique Heat Protecting Spray (27)
Full ingredient list — Genesis Defense Thermique Blow Dry Primer (37)

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.

VerdictsDiscipline Fluidissime Thermique Heat Protecting SprayGenesis Defense Thermique Blow Dry Primer
Supported
3
1
Partly supported
1
2
Stated by brand
0
3
Potential conflict
0
0

Discipline Fluidissime Thermique Heat Protecting Spray

  • Anti-frizz protection for up to 72 hoursSupportedSmoother strands, less frizz.
  • Heat protectant with 450F thermo-protectionPartly supportedSold for hot tools; untestable here.
  • Illuminates shiny hairSupportedReflects light for visible shine.
  • Multi-tasking leave-in product that protects against heat damage, improves shine and suppleness, and adds movementSupportedReflects light for visible shine.

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.

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 a light feel, the scent, and frizz control. Kerastase Discipline Fluidissime Thermique Heat Protecting Spray draws complaints about dryness and dullness.

Discipline Fluidissime Thermique Heat Protecting Spray

Users report frizz and flyaway control in humidity with a pleasant scent.

Bayareasandra and Angel05, official reviews

Fine and frizz-prone users report soft smooth manageable hair, shine, and heat protection without grease.

MrsJen, current official verified review

A reviewer reports dryness and a dull film after several uses.

Marilyn NYC, official review

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

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

$0.01/oz median $2.46/oz $76.00/oz $9.80/oz Discipline Fluidissime The $9.80/oz Genesis Defense Thermique

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

Value readDiscipline Fluidissime Thermique Heat Protecting SprayGenesis Defense Thermique Blow Dry Primer
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.

Discipline Fluidissime Thermique Heat Protecting Spray vs Chroma Absolu Serum Chroma ThermiqueKerastase · 95% function matchGenesis Defense Thermique Blow Dry Primer vs Pureology Color Fanatic Multi-Tasking Leave-In Conditioner SprayPureology · 90% function matchDiscipline Fluidissime Thermique Heat Protecting Spray vs Daily ProvisionKenra · 95% function matchGenesis Defense Thermique Blow Dry Primer vs Bond Rx Leave-In TreatmentPaul Mitchell · 90% function matchDiscipline Fluidissime Thermique Heat Protecting Spray vs Dream Cocktail Kale-Infused Leave-in TreatmentColor Wow · 95% function matchGenesis Defense Thermique Blow Dry Primer vs Blond Absolu Blonde Guard Hydrating Leave-In Conditioner Spray with Hyaluronic AcidKerastase · 88% function matchDiscipline Fluidissime Thermique Heat Protecting Spray vs ProVitamin Leave-In ConditionerAphogee · 93% function matchGenesis Defense Thermique Blow Dry Primer vs Shea Pro Leave-in MoisturizerAphogee · 87% function match

Discipline Fluidissime Thermique Heat Protecting Spray · Genesis Defense Thermique Blow Dry Primer · 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.
  • 9 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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