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CHI

44 Iron Guard Thermal Protection Spray

Heat protectant / Spray, heat-protecting

  • Heat protectant
  • spray
  • Also a leave-in
  • Sulfate-free
  • Silicone-free
  • Curly-method
  • Not vegan · ingredient list
Size8 fl ozmost listed · 3 sizes
Price$15–18commonly seen · 8 oz
Price / oz$2.09/ozat 8 oz
Where to buy6 stores · 3 sizes

Scent:

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

Listing used for research: ulta.com

Personal fit

Is this right for you?

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Priced with its peers

$2.09/oz at 8 oz — less than 54% of the 549 heat protectants , which mostly run $1.25–5.69/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
Fine hairthat flattens under most products
Silicone-free routinesno silicones appear in the list
Stretching wash daysnothing here needs a detergent to remove

Maybe skip if

this product carries a scent
Protein-sensitive hairthat goes stiff or straw-like on protein
Very dry or damaged hairit contains fast-drying alcohol
Dry or very humid airwhere heavy humectants work against you
Vegan and cruelty-freeour record does not support both claims here
Tight budgetsit sits in the upper price tiers

How much heat protection you need depends on how often and how hot you style — that is what the consultation works out.

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 — 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 — this is a detangling formula.

Needs detergent to remove No

Nothing here needs a detergent wash to remove.

Water-binding (humectants) High

Humectants near the top — water-binding is a headline mechanism here.

Fast-drying alcohol High in the list

Fast-drying alcohol in the first three ingredients.

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. These 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
Sodium Polystyrene Sulfonate film former Lays down the film that holds a shape Holds
Alcohol Denat. drying alcohol Speeds drying — and can read dry on the hair Drying
Polysorbate 20 solubilizer Keeps oils dissolved in water Stabilizes
Propanediol humectant Pulls water into the hair Moisturizes
Cocodimonium Hydroxypropyl Hydrolyzed Keratin conditioning agent Conditions and softens — this is what makes it comb through Protein
Hydrolyzed Silk film former Lays down the film that holds a shape Protein
Caprylyl Glycol preservative Keeps the product from spoiling Moisturizes
FragranceFragrance (Parfum) fragrance The scent Fragrance
Benzyl Benzoate fragrance The scent Fragrance
Citronellol fragrance The scent Fragrance
Hexyl Cinnamal fragrance The scent Fragrance
What the list leaves out, and what it carriesNo sulfates or silicones. Protein-forward — a strengthening formula, not a moisture one. Contains fragrance. Fast-drying alcohol is in the list.
Full ingredient list (20)

US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order. Annotations keep three readings separate: the ingredient's general function, its role in this product type, and what its position can support.

  • 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 Sodium Polystyrene Sulfonate
    General function

    A film-forming polymer used for hold and to help other ingredients deposit.

    Leading ingredient

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

    May suitClimate-sensitive or frizz-prone hair

    A set polymer film is a physical barrier to humidity, so a style keeps its shape longer in damp conditions.

    May suitMaximum-hold styling

    Synthetic film formers dry into a continuous film, which is what holds a shape against movement and against humid air.

    DependsBuild-up-sensitive routines

    Some acrylate copolymers rinse with water and some need a detergent; the label alone does not say which one a formula used.

    • film former
    • polymer
  • 3 Alcohol Denat.
    General function

    Fast-drying alcohol used to make sprays set quickly. In leave-on products it can leave hair feeling dry, especially in high position on the list.

    Leading ingredient

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

    May suitFine or easily flattened hair

    Evaporates on contact, which is how a spray sets almost instantly and leaves no weight behind it.

    May not suitDry, coarse, or high-porosity hair

    Porous hair gives water up easily as it is; a fast-evaporating solvent high on the list accelerates that.

    May not suitVery dry or highly damaged hair

    It evaporates quickly and takes some water with it. On hair already short of moisture, a formula built on a lot of it can finish drier than it started.

    PubChem
    • drying alcohol
    • solvent
  • 4 Polysorbate 20
    General function

    Keeps fragrance and oils dissolved in a watery formula so it stays clear.

    Supporting ingredient

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

    • solubilizer
    • emulsifier
  • 5 Propanediol
    General function

    A corn-derived humectant and solvent, often chosen as a lighter-feeling alternative to propylene glycol.

    Supporting ingredient

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

    May suitFine or easily flattened hair

    Light and water-binding rather than oily, so it hydrates without contributing weight.

    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
  • 6 Cocodimonium Hydroxypropyl Hydrolyzed Keratin
    General function

    A protein given a positive charge so it deposits where hair is damaged. It conditions and adds temporary firmness in one ingredient.

    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 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.

    • conditioning agent
    • film former
    • protein
    • hydrolysed protein
  • 7 Hydrolyzed Silk
    General function

    A light protein used for slip and shine rather than strength.

    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

    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
  • Below about this point, order stops being meaningful — these are typically used at 1% or less.
  • 8 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
  • 9 Phenoxyethanol
    • preservative
  • 10 Ppg-20 Methyl Glucose Ether
    • emulsifier
  • 11 Potassium Sorbate
    • preservative
  • 12 Hexylene Glycol
    General function

    A solvent that keeps other ingredients dissolved and helps preservatives work.

    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

    Light and water-binding rather than oily, so it hydrates without contributing weight.

    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
    • solvent
    • humectant
  • 13 Citric Acid
    General function

    Used to bring the product to a slightly acidic pH, which helps the cuticle lie flat. It is almost always near the end of the list.

    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 suitBuild-up-sensitive routines

    Holds hard-water minerals in solution so they rinse away instead of depositing on the hair.

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

    The acid side of pH adjustment, and the reason it matters is measured: alkaline formulas raise the fibre's surface negative charge, increase friction between strands and lift the scales, while lower-pH ones do the reverse.

    May suitGray, silver, or brass-prone hair

    Where a warm cast comes from water minerals rather than from the hair itself, holding those metals in solution is what removes it.

    International Journal of Trichology
    • pH adjuster
    • hard-water chelator
  • 14 Alumina
  • 15 Silica
    General function

    A fine mineral powder that absorbs oil and adds grip. It is what makes texture powders and matte pastes feel dry to the touch.

    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 dry powder takes up oil and adds friction between strands, which is most of what root lift in fine hair actually is.

    PubChem
    • powder
    • thickener
    • mineral
  • 16 Fragrance · Fragrance (Parfum)
    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
  • 17 Benzyl Benzoate
    General function

    A fragrance component with a faint balsamic scent, named separately on the label because it is a recognised contact allergen.

    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

    One of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.

    PubChem
    • fragrance
    • named fragrance allergen
  • 18 Citronellol
    General function

    A rose-like fragrance component named separately as a recognised allergen.

    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

    One of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.

    PubChem
    • fragrance
    • named fragrance allergen
  • 19 Hexyl Cinnamal
    General function

    A jasmine-like fragrance component named separately as a recognised allergen.

    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

    One of the 26 scent components the EU requires to be named individually above a threshold. It is named because it is a known contact allergen, not because it is unusual.

    PubChem
    • fragrance
    • named fragrance allergen
  • 20 Titanium Dioxide · Titanium Dioxide (CI 77891)
    General function

    A white mineral pigment that makes a product opaque or pearly.

    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 suitGray, silver, or brass-prone hair

    A violet or blue colorant sits opposite yellow on the colour wheel, so a trace of it deposited on the surface makes a warm cast read cooler. It washes out over the following few washes.

    • colourant
    • opacifier
    • mineral

What the whole list adds up to

  • 4 solvents
  • 4 fragrances
  • 3 film formers
  • 3 humectants
  • 3 preservatives
  • 3 named fragrance allergens
  • 2 emulsifiers
  • 2 proteins
  • 2 hydrolysed proteins
  • 2 minerals
  • 1 polymer
  • 1 drying alcohol
  • 1 solubilizer
  • 1 conditioning agent

Ingredient list captured 2026-08-22. Formulas change — check the package in your hand when an ingredient matters to you.

Price · 8 oz

Commonly seen $15–18 Midpoint $16.74 · 3 stores · checked Aug 29

Sizes

2 oz
$4.99
$2.50/oz
8 ozmost listed
$15–18
$2.09/oz
8.5 oz
$32.99
$3.88/oz

The 8 oz costs the least per ounce — 46% less than the 8.5 oz.

Show the price ladder
Where we’ve seen it7 listings · 5 stores

8 ozmost listedBest per ounce

  • JCPenney
    $13.49
    8 oz · $1.69/oz
    Aug 29Lowest per ozSale · was $20.00
  • Walmart
    $16.74
    8 oz · $2.09/oz
    Aug 29Sale · was $18.99
  • Target
    $17.59
    8 oz · $2.20/oz
    Aug 22
  • CVS
    $19.99
    8 oz · $2.50/oz
    Aug 29
  • chi.com
    $20.00
    8 oz · $2.50/oz
    Aug 22

2 oz

  • Target
    $4.99
    2 oz · $2.50/oz
    Aug 29Lowest per oz

8.5 oz

  • Target
    $32.99
    8.5 oz · $3.88/oz
    Aug 29Lowest per ozSale · was $40.00

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. 8 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. Commonly seen is the middle half of current prices for the 8 oz at recognised stores — the cheapest quarter and the dearest quarter are left out, so one sale or one overpriced listing can’t move it.
  3. Each size is guarded on its own, so a multipack or a marketplace listing at one size cannot move another.
  4. About $19 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

The formula carries the systems a heat protectant is built around, and it sits in the middle of the range for heat protectants per ounce.

How the score is counted
  • 3 products we score as doing the same job cost less per ounce
  • Costs less per ounce than 54% of the 549 heat protectants we’ve priced
  • Covers 6 of the 6 things a heat protectant should do
  • Reviewers mention 2 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 is completeness for the job: the share of the systems this product type is normally built around that we can find in this list, weighted. It is not efficacy, not quality, and it never compares across product types.

Does the same job, for less

Same derived functions — what it cleans, conditions, coats or holds — at a lower cost per ounce. Scent, texture and where you buy it can still differ.

CHIClosest function 44 Iron Guard Botanical Bliss $0.95/oz $1.14/oz less
  • Heat protect
  • Protein
  • Lightweight
Function
  • Film formers
Also
  • Mint scent
  • Sold online
Compare
K18Lowest cost per oz Leave-In Molecular Repair Hair Mask $0.01/oz $2.08/oz less
  • Protein
  • Curly method
  • Silicone-free
· Close function
Function
  • Film formers
  • Weight on the hair
Also
  • Cruelty-free
  • Prestige tier
  • 1.7 oz bottle
Compare
CurlyKidsClose function Honey Combout Moisturizing Detangler $0.88/oz $1.21/oz less
  • Budget
Function
  • Film formers
Also
  • Drugstore tier
Compare

See more alternatives in the product library

These are functional neighbours, not personal recommendations — they are close on formula, not chosen for anyone. Get the one that fits your hair, routine, and budget

Built for straight to curly hair

Final decision

Should you buy it?

Good for the right person
Best user

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

Biggest tradeoff

Less suited to anyone sensitive to fragrance, hair that stiffens on protein, or very dry or high-damage hair

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, against what the formula shows

Claims are quoted from the brand. We only mark one supported, partly supported, or conflicting when the ingredient list actually speaks to it; everything else stays "stated by the brand", which is not a criticism — most claims simply cannot be read off a label.

0
SupportedBacked by ingredients
2
Partly supportedSome supporting logic
2
Stated by brandNo clear evidence
0
Potential conflictFormula works against claim
Superior heat protection from the inside out against styling and finishing damages

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

  • Sodium Polystyrene Sulfonate
  • Cocodimonium Hydroxypropyl Hydrolyzed Keratin
  • Hydrolyzed Silk
Partly supported

Sold for hot tools; untestable here.

Protects Hair from Thermal Tools

This is a marketing claim; an ingredient list cannot speak to it.

Stated by brand

Can’t be confirmed from label.

Designed to withstand 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.

  • Sodium Polystyrene Sulfonate
  • Cocodimonium Hydroxypropyl Hydrolyzed Keratin
  • Hydrolyzed Silk
Partly supported

Sold for hot tools; untestable here.

Will not clump or build up resulting in no flakes

No flake-prone resins sit high in the list, but flaking depends on how much you use.

Stated by brand

Can’t be confirmed from label.

How to read this

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

Reviewers

What people report

Recurring themes our researchers wrote in their own words from sourced reviews. We do not store or scrape star ratings.

Helps tame wavy, frizz-prone hair

Praised for scent as a good first CHI product for thick hair

Sprays on sticky/heavy like a protecting wax, leaves hair tacky and dry after heat styling

More from CHI

How this page was made

  • Everything above is generated from our researched product record — identity, the ingredient list as printed, the brand's own claims, dated price observations, and review themes written in our researchers' own words. No part of this page is written per 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.
  • 5 sources consulted for this product (4 manufacturer or regulatory, 1 retailer, 0 editorial), last checked 2026-08-25.
  • Ingredient references are linked for 9 of 14 product-aware annotations on this page. Fit notes are conditional formulation guidance, not a conclusion about the finished product or about you.
  • We have not tested this product in a lab and we do not physically test your hair. Formula readings come from the ingredient list; behaviour claims are labelled as the brand's.
  • Ingredient order tells you relative amount only above roughly 1%. Prices are observations on the dates shown and change without notice.
  • 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 v22. Record last updated 2026-08-25.