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Garnier Fructis

Diamond Sleek Shine-Coat Smoothing Spray

Heat protectant / Spray, heat-protecting

  • Heat protectant
  • spray
  • Also a leave-in
  • Also a finisher
  • Sulfate-free
  • Moisture-rich
  • Lightweight
Size4.6 fl oz
Price$7.99seen at one store · 4.6 oz
Price / oz$1.74/ozat 4.6 oz
Where to buy1 store

Add it to your products. We’ll tell you if it’s ever recalled.

Scent:

The ingredient list declares fragrance. What it smells of is not stated, and we do not guess.

Manufacturer page: garnierusa.com

Personal fit

Is this right for you?

Complete the consultation to see how well this product fits your hair and your goals. With 6,000+ products in our library, we can match you to the right ones.

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$49 with 60 days of follow-up questions and plan updates

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Lower cost than most heat protectants

$1.74/oz at 4.6 oz, less than 77% of the 1437 heat protectants , which mostly run $1.82–7.60/oz.

Price and stores

Great for

Heat stylingthe brand states protection to 450°F
Protein-hungry hairthat stretches and stays stretched when wet
Maximum slipfor hair that tangles the moment it is wet
Dry, thirsty hairhumectants and emollients both sit up front
Fine hairthat flattens under most products
Very dry hairno fast-drying alcohol in the list

Maybe skip if

this product has a scent
Curly-method routinesthese silicones need a detergent to remove
Protein-sensitive hairthat goes stiff or straw-like on protein
Dry or very humid airwhere heavy humectants work against you

How much heat protection you need depends on how often and how hot you style. Your consultation takes that into account.

What the formula actually does

Read from the label, not the marketing

Each row says where it comes from: F means we derived it from this product’s own ingredient list, S means it is a claim the brand makes that the formula neither confirms nor contradicts.

Heat protection Stated to 450°F

The brand states a protection temperature. That is a label claim, not a measurement.

Weight on the hair Light

Water-first and light: unlikely to flatten fine hair.

Slip and detangling High

Conditioning agents sit high in the list, so this is a detangling formula.

Needs detergent to remove Yes

Water-insoluble silicones or waxes: a detergent wash is what removes them.

Water-binding (humectants) High

Humectants near the top: binding water is one of its main jobs.

Fast-drying alcohol None

No fast-drying alcohol in the list.

Fragrance Present

Fragrance is listed; it sits below the working ingredients.

from the formula stated by the brand reported by reviewers Scale: 1 dot low · 5 dots high, within this product type.

Ingredients that matter

The ingredients that change a decision

The workhorse ingredients, plus anything lower down that changes a decision. The chips name what an ingredient does. They are not safety scores, and no ingredient here is rated good or bad on its own.

IngredientWhat it doesWhy it mattersChip
WaterAqua/Water/Eau solvent The base everything else is dissolved in Neutral
Glycerin humectant Pulls water into the hair Moisturizes
Dipropylene Glycol humectant Pulls water into the hair Moisturizes
PEG-60 Hydrogenated Castor Oil solubilizer Keeps oils dissolved in water Stabilizes
Laureth-4 emulsifier Keeps oil and water mixed Stabilizes
Argania Spinosa Kernel Oil oil Coats and softens the strand Softens
Stearamidopropyl Dimethylamine conditioning agent Conditions and softens so hair combs through Detangles
Sodium Hydroxide pH adjuster Fine-tunes the pH pH balancer
Hydrolyzed Corn Protein film former A supporting film former Protein
Hydrolyzed Soy Protein film former A supporting film former Protein
Hydrolyzed Wheat Protein film former A supporting film former Protein
Polysilicone-29 silicone A little heat-spreading smoothing Buildup
What the list leaves out, and what it carriesNo sulfates or drying alcohols. Protein-forward: a strengthening formula, not a moisture one. Contains fragrance. The silicones here need a detergent wash to come off.
Full ingredient list (18)

In the US, ingredients above 1% are listed from most to least. Below 1% they can appear in any order. Each note keeps three things apart: what the ingredient generally does, its role in this type of product, and what its position can tell you.

  • 1 Water · Aqua/Water/Eau
    General function

    The base of almost every rinse-off and cream hair product. It carries everything else and is normally the first ingredient on the label.

    Leading ingredient

    Listed in the first three ingredients, it is likely a structural part of this formula.

    • solvent
  • 2 Glycerin
    General function

    Glycerin, also called glycerol, attracts moisture and mixes completely with water.

    Leading ingredient

    Listed in the first three ingredients, it is likely a structural part of this formula.

    May suitDry, coarse, or high-porosity hair

    High-porosity hair loses water fast; a humectant holds some of it in place for longer than the wash itself would.

    May suitVery dry or highly damaged hair

    Binds water into the outer layers of the strand, and water is what makes dry hair flexible again rather than brittle.

    DependsClimate-sensitive or frizz-prone hair

    Water moves both ways. Measured across concentrations, glycerin solutions give water up in some conditions and take it from the air in others. What it does for you depends on how much of it is there and on the air around it.

    Scientific Reports
    • humectant
  • 3 Dipropylene Glycol
    General function

    A light humectant and solvent that helps fragrance and extracts dissolve evenly.

    Leading ingredient

    Listed in the first three ingredients, it is likely a structural part of this formula.

    May suitFine or easily flattened hair

    Light and water-binding rather than oily, so it adds less weight than oils or butters do.

    May suitVery dry or highly damaged hair

    A small water-binding solvent. It holds moisture and helps the rest of the formula spread evenly over the strand.

    DependsClimate-sensitive or frizz-prone hair

    A humectant follows the air: it holds water in humid conditions and can give it up in very dry ones. Climate decides what it does more than the label does.

    PubChem
    • humectant
    • solvent
  • 4 PEG-60 Hydrogenated Castor Oil
    General function

    A castor-derived solubiliser that keeps fragrance and oils dissolved in clear liquids.

    Supporting ingredient

    Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.

    • solubilizer
    • emulsifier
  • 5 Laureth-4
    General function

    An oil-side emulsifier that helps a cream hold together.

    Supporting ingredient

    Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.

    • emulsifier
  • 6 Argania Spinosa Kernel Oil
    General function

    Argan oil. A medium-weight oil used for shine and softness on the outside of the strand.

    Supporting ingredient

    Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.

    May suitDry, coarse, or high-porosity hair

    Coats the surface and slows water leaving the strand, which is usually what coarse hair that dries out fast is missing.

    May suitFrizz-prone, damaged, or high-friction hair

    A thin oil layer lowers friction between strands and flattens the raised cuticle that scatters light and catches on its neighbours.

    May not suitFine or easily flattened hair

    Near the top of a list an oil is weight before it is anything else, and fine hair shows that first at the roots.

    • oil
    • emollient
  • 7 Stearamidopropyl Dimethylamine
    General function

    A gentle conditioning agent activated by the acid in the formula. It smooths the cuticle without much build-up.

    Supporting ingredient

    Listed in positions 4–8, it likely makes a meaningful contribution alongside the formula's main ingredients.

    May suitFrizz-prone, damaged, or high-friction hair

    A cationic conditioning agent: it binds to the damaged, negatively charged parts of the cuticle and lowers combing friction there.

    May suitVery dry or highly damaged hair

    The class that does the detangling in a conditioner. It deposits lubrication where the cuticle is worn.

    DependsBuild-up-sensitive routines

    Substantive by design. A routine with no detergent wash gives it nothing to leave with.

    PubChem
    • conditioning agent
  • ▾Below about here, the order stops meaning much. These are usually used at 1% or less.
  • 8 Sodium Hydroxide
    General function

    A strong base used in trace amounts to raise pH; fully neutralised in the finished product.

    Estimated lower-concentration zone

    It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

    DependsFrizz-prone, damaged, or high-friction hair

    The alkali half of a pH-adjusting pair, used in small amounts to bring a formula up to its target rather than to make it alkaline. Alkaline conditions raise the fibre's surface charge and lift the scales — but the finished pH is not on the label.

    International Journal of Trichology
    • pH adjuster
  • 9 Isononyl Isononanoate
    General function

    A very light, dry-feeling ester used where a silky finish without weight is wanted.

    Estimated lower-concentration zone

    It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

    May suitFine or easily flattened hair

    A light emollient: it softens the surface with noticeably less weight than an oil or a butter.

    May suitFrizz-prone, damaged, or high-friction hair

    Spreads thin and lowers friction between strands without the heaviness of a fixed oil.

    • light ester
    • emollient
  • 10 Hydrolyzed Corn Protein
    General function

    A plant protein used in strengthening blends, often with wheat and soy.

    Estimated lower-concentration zone

    It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

    May suitFrizz-prone, damaged, or high-friction hair

    Filling surface gaps evens out the cuticle, which is part of what makes damaged hair comb and reflect light more like undamaged hair.

    May suitMaximum-hold styling

    Film formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.

    May suitVery dry or highly damaged hair

    Hydrolysed fragments are small enough to sit in the gaps of a worn cuticle for a wash or two, temporarily restoring stiffness and cutting breakage in combing.

    • film former
    • protein
    • hydrolysed protein
  • 11 Hydrolyzed Soy Protein
    General function

    A plant protein used for body and moisture retention.

    Estimated lower-concentration zone

    It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

    May suitFrizz-prone, damaged, or high-friction hair

    Filling surface gaps evens out the cuticle, which is part of what makes damaged hair comb and reflect light more like undamaged hair.

    May suitMaximum-hold styling

    Film formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.

    May suitVery dry or highly damaged hair

    Hydrolysed fragments are small enough to sit in the gaps of a worn cuticle for a wash or two, temporarily restoring stiffness and cutting breakage in combing.

    • film former
    • protein
    • hydrolysed protein
  • 12 Hydrolyzed Wheat Protein
    General function

    Wheat protein broken into fragments small enough to cling to the hair. It adds temporary strength and body; too much can feel stiff.

    Estimated lower-concentration zone

    It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

    May suitFrizz-prone, damaged, or high-friction hair

    Filling surface gaps evens out the cuticle, which is part of what makes damaged hair comb and reflect light more like undamaged hair.

    May suitMaximum-hold styling

    Film formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.

    May suitVery dry or highly damaged hair

    Hydrolysed fragments are small enough to sit in the gaps of a worn cuticle for a wash or two, temporarily restoring stiffness and cutting breakage in combing.

    • film former
    • protein
    • hydrolysed protein
  • 13 Caprylyl Glycol
    General function

    A gentle preservative helper that also holds a little moisture.

    Estimated lower-concentration zone

    It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

    May suitVery dry or highly damaged hair

    Humectants bind water into the strand, and water — not oil — is what makes dry hair flexible instead of brittle.

    DependsClimate-sensitive or frizz-prone hair

    A humectant follows the air: it holds water in humid conditions and can give it up in very dry ones. Climate decides what it does more than the label does.

    PubChem
    • preservative
    • humectant
  • 14 Lactic Acid
    General function

    An acid used to set pH and, in scalp products, to loosen flakes.

    Estimated lower-concentration zone

    It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

    May suitDry, coarse, or high-porosity hair

    High-porosity hair loses water fast; a humectant holds some of it in place for longer than the wash itself would.

    May suitVery dry or highly damaged hair

    Binds water into the outer layers of the strand, and water is what makes dry hair flexible again rather than brittle.

    DependsClimate-sensitive or frizz-prone hair

    A humectant moves water in whichever direction the air allows: it holds moisture in humid conditions and can pull it back out of hair in very dry ones.

    PubChem
    • pH adjuster
    • humectant
    • exfoliant
  • 15 Polysilicone-29
    General function

    A silicone network that leaves a longer-lasting smoothing film than plain dimethicone.

    Estimated lower-concentration zone

    It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

    May suitClimate-sensitive or frizz-prone hair

    A surface film slows how quickly humidity reaches the cortex, which is what limits swelling-driven frizz in damp air.

    May suitFrizz-prone, damaged, or high-friction hair

    Lays a smooth film along the cuticle, which lowers combing friction and flattens the surface irregularities that read as frizz.

    May suitMaximum-hold styling

    Film formers are what hold a style: they dry into a connected film across the strands so the shape resists movement.

    • silicone
    • film former
  • 16 Hexyl Laurate
    • light ester
    • emollient
  • 17 Phenoxyethanol
    • preservative
  • 18 Fragrance · Parfum/Fragrance
    General function

    An undisclosed blend of scent ingredients. Regulations let it stay unlisted, so a fragrance-free product is the only way to be certain what is not in it.

    Estimated lower-concentration zone

    It appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.

    May not suitFragrance-sensitive routines

    Declared fragrance. On a fragrance-sensitive routine this is the line that decides it, wherever it sits on the label.

    • fragrance
    • declared fragrance

What the whole list adds up to

  • 4 humectants
  • 4 film formers
  • 3 emollients
  • 3 proteins
  • 3 hydrolysed proteins
  • 2 solvents
  • 2 emulsifiers
  • 2 pH adjusters
  • 2 light esters
  • 2 preservatives
  • 1 solubilizer
  • 1 oil
  • 1 conditioning agent
  • 1 exfoliant

Ingredient list captured 2026-08-23. Formulas change, so check the package in your hand when an ingredient matters to you.

Price · 4.6 oz

Seen at $7.99 1 store · checked Aug 23
Show the price ladder
Where we’ve seen it1 listing · 1 store
  • Target
    $7.99
    4.6 oz · $1.74/oz
    Aug 23Lowest per oz

Sorted by price per ounce. Dated observations from our research, not live prices. Direct store pages, no affiliate links. We don’t sell this product.

How we work this out
  1. 4.6 oz is the size stores list most often; every comparison on this page is made at it. Other sizes are shown in the Sizes row and the store list.
  2. Seen at $7.99 is the price we have observed for the 4.6 oz. We need three stores before we call a price commonly seen.
  3. About $18 is what heat protectants typically cost at this size. Too few of the products that do the same job carry a price for us to draw a good-value line.

Formula

Formula score
10 of 10

This formula covers the systems a heat protectant is built around, and it costs less per ounce than most of the heat protectants we have researched.

How the score is counted
  • 3 products we score as doing the same job cost less per ounce
  • Costs less per ounce than 77% of the 1437 heat protectants we’ve priced
  • Covers 6 of the 6 things a heat protectant should do
  • Reviewers mention 3 things they like about how it performs
  • A film-forming heat spreaderSilicones or polymers that spread heat along the strand.3 pts
  • A stated heat claimThe brand names the protection it claims.2 pts
  • A light baseWater or a volatile carrier first, so it does not weigh hair down.2 pts
  • A humectantBinds water into the hair.1 pt
  • Slip for detanglingReduces the force it takes to comb wet hair.1 pt
  • Fragrance kept out of the top eightScent as a finishing touch, not a major share.1 pt

The formula score measures completeness for the job: a weighted share of the systems this product type is usually built around that we find in this list. It does not rate how well the product works or its quality, and it never compares across product types.

Does the same job, for less

Formulas that do the same things (cleanse, condition, coat or hold) for less per ounce. Scent, texture and where you buy them can still differ.

DoveClosest function Curl Nourishment Detangler Cream $1.15/oz $0.59/oz less
  • Budget
Differs
  • Cruelty-free
  • 6.5 oz bottle
  • Sold online
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Mane 'n TailClose function Herbal Gro Hair Therapy Spray $1.25/oz $0.49/oz less
  • Protein
  • Alcohol-free
  • Medium weight
Function
  • Water-binding (humectants)
  • Weight on the hair
Also
  • Masstige tier
  • 2 oz bottle
Compare
Palmer'sLowest cost per oz Tahitian Vanilla Leave-In Conditioner $0.67/oz $1.07/oz less
  • Protein-free
  • Alcohol-free
  • Medium weight
· Close function
Function
  • Weight on the hair
  • Protein
Also
  • Sweet scent
  • 8.5 oz bottle
Compare

See more alternatives in the product library

These products do a similar job. We haven’t matched them to you. Find the one that fits your hair, routine and budget

Built for straight to curly hair

Final decision

Should you buy it?

A solid pick for the hair it suits
Best user

People who blow-dry or flat-iron, looking for heat protection and protein high in the formula

Biggest tradeoff

Worth skipping for anyone sensitive to fragrance, curly-method routines, or hair that stiffens on protein

We do not sell products or take placement fees. This page states what the formula and the prices show; the consultation is what matches it to a person.

Claims check

What the brand says, and what the formula shows

Claims are quoted from the brand. We mark a claim supported, partly supported or conflicting only when the ingredient list speaks to it. Everything else stays "stated by the brand". That isn’t a criticism: most claims can’t be checked from a label.

3
SupportedBacked by ingredients
1
Partly supportedSome supporting logic
1
Stated by brandNo clear evidence
0
Potential conflictFormula works against claim
Shields hair against temperatures up to 450F

Our library captures this as a heat protectant, but thermal protection is measured in a lab, not read off a list.

  • Hydrolyzed Corn Protein
  • Hydrolyzed Soy Protein
  • Hydrolyzed Wheat Protein
Partly supported

Sold for hot tools; untestable here.

Heat-activated anti-frizz heat protectant spray

Silicones or film formers smooth the cuticle, which is the usual mechanism.

  • Argania Spinosa Kernel Oil
  • Hydrolyzed Corn Protein
  • Hydrolyzed Soy Protein
Supported

Smoother strands, less frizz.

Up to 100 Hours of Frizz-Free Sleek

Silicones or film formers smooth the cuticle, which is the usual mechanism.

  • Argania Spinosa Kernel Oil
  • Hydrolyzed Corn Protein
  • Hydrolyzed Soy Protein
Supported

Smoother strands, less frizz.

Diamond-Like Shine

The formula carries a recognised shine system — silicone, oil, or light ester.

  • Argania Spinosa Kernel Oil
  • Isononyl Isononanoate
  • Polysilicone-29
Supported

Reflects light for visible shine.

Up to 3X Smoother hair

A brand-run study. We report it as stated and do not repeat the number as fact.

—

Stated by brand

Only the brand’s testing shows this.

How to read this

We look at the first 10–15 ingredients and what they do in a formula, not at the marketing. If the list doesn't speak to a claim, we don't assume.

Reviewers

What people report

Themes that come up again and again in sourced reviews, written by our researchers in their own words. We don’t store or scrape star ratings.

Reduces frizz with a lightweight, nonsticky finish

Target reviewers

Heat-activated use improves smoothness and shine

Target reviewer

Leaves coarse or curly hair smooth and shiny

Target reviewers

More from Garnier Fructis

How this page was made

  • Everything above comes from our researched product record: identity, the ingredient list as printed, the brand's own claims, dated prices and review themes our researchers wrote in their own words. No part of this page is written by hand for one product.
  • 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.
  • Both scores out of ten are defined on this page. The formula score is completeness for the job, computed from a fixed per-format checklist shown beneath the gauge; the price score is cost per ounce against every product of this type we have priced.
  • 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.
  • 4 sources consulted for this product (3 manufacturer or regulatory, 1 retailer, 0 editorial), last checked 2026-08-25.
  • Ingredient references are linked for 6 of 13 product-aware annotations on this page. Fit notes are general formulation guidance. They aren’t a verdict on the finished product or on you.
  • We haven’t tested this product in a lab, and we don’t physically test your hair. Formula readings come from the ingredient list. Claims about how it behaves are labelled as the brand's.
  • Ingredient order tells you relative amount only above roughly 1%. Prices are what we saw on the dates shown and can change.
  • Ingredient names link to our ingredient library, where each entry shows what it does, which product types use it, and where it usually sits on a label across everything we have researched.
  • This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.
  • Formula readings: derivation v23. Record last updated 2026-08-25.

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