Side by side
amika The Shield Anti-Humidity Spray vs Kevin Murphy Heated.Defense
83% function match · 7 of the 10 functions we compared match Formula overlap 7%. amika The Shield Anti-Humidity Spray and Kevin Murphy Heated.Defense share 1 ingredient among each other's most prominent.
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
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When each one is the right call
What each formula is built for, from its own ingredient list.
- The Shield Anti-Humidity Spray — heat styling
- Heated.Defense — 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”.
- Heat stylingthe brand states protection to 450°F
- Protein-hungry hairthat stretches and stays stretched when wet
- Very dry hairno fast-drying alcohol in the list
- Sun and colour fadea UV filter is in the list
- Heat stylingthe brand states protection to 450°F
- Protein-hungry hairthat stretches and stays stretched when wet
- Very dry hairno fast-drying alcohol in the list
- A wide range of haira middle-of-the-range weight
- Scents bother youthis product carries a scent
- Curly-method routinesthese silicones need a detergent to remove
- Protein-sensitive hairthat goes stiff or straw-like on protein
- Scents bother youthis product carries a scent
- Curly-method routinesthese silicones need a detergent to remove
- Protein-sensitive hairthat goes stiff or straw-like on protein
More facts about each one
- sulfate-free
- sulfate-free
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.
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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
What only one of them carries
The Shield Anti-Humidity Spray
Full ingredient list — The Shield Anti-Humidity Spray (29)
-
1
Butane
- propellant
-
2
Disiloxane
- silicone
- emollient
-
3
Water
- solvent
-
4
Propane
- propellant
- Below about this point, order stops being meaningful — these are typically used at 1% or less.
-
5
Hippophae Rhamnoides (Sea Buckthorn) Fruit Oil
- oil
- emollient
- antioxidant
-
6
Cetearyl Alcohol
- fatty alcohol
- emollient
- thickener
-
7
Hydrolyzed Vegetable Protein
- film former
- protein
- hydrolysed protein
-
8
Hydrolyzed Wheat Protein
- film former
- protein
- hydrolysed protein
-
9
Behentrimonium Chloride
- conditioning agent
- cleanser
-
10
Cetrimonium Chloride
- conditioning agent
- cleanser
-
11
Cetyl Peg/Ppg-10/1 Dimethicone
- silicone
- conditioning agent
-
12
Phenyl Trimethicone
- silicone
- emollient
-
13
Cinnamidopropyltrimonium Chloride
- conditioning agent
- UV filter
-
14
Oleth-10
- emulsifier
- solubilizer
-
15
Glycerin
- humectant
-
16
Ethylhexylglycerin
- preservative
- emollient
-
17
Ceresin
- wax
- sealant
-
18
Polyquaternium-11
- film former
- polymer
- conditioning agent
-
19
Guar Hydroxypropyltrimonium Chloride
- conditioning agent
- polymer
- gum
-
20
Citric Acid
- pH adjuster
- hard-water chelator
-
21
Potassium Sorbate
- preservative
-
22
Sodium Benzoate
- preservative
-
23
Phenoxyethanol
- preservative
-
24
Fragrance
- fragrance
- declared fragrance
-
25
Benzyl Benzoate
- fragrance
- named fragrance allergen
-
26
Hydroxycitronellal
- fragrance
- named fragrance allergen
-
27
Limonene
- fragrance
- named fragrance allergen
-
28
Citronellol
- fragrance
- named fragrance allergen
-
29
Coumarin
- fragrance
- named fragrance allergen
Full ingredient list — Heated.Defense (24)
-
1
Water
- solvent
-
2
Cetyl Triethylmonium Dimethicone Peg-8 Succinate
- emollient
- light ester
- silicone
-
3
Polysorbate 20
- solubilizer
- emulsifier
-
4
Hydrolyzed Quinoa
- film former
- protein
- hydrolysed protein
-
5
Hydrolyzed Wheat Protein
- film former
- protein
- hydrolysed protein
-
6
Simmondsia Chinensis (Jojoba) Seed Oil
- emollient
- light ester
- oil
- wax
- Below about this point, order stops being meaningful — these are typically used at 1% or less.
-
7
Piper Nigrum (Pepper) Seed Oil
- botanical extract
- essential oil
- fragrance
-
8
Ricinus Communis (Castor) Seed Oil
- oil
- emollient
-
9
Amyris Balsamifera Bark Oil
- oil
- emollient
-
10
Caprylyl Glycol
- preservative
- humectant
-
11
Hexylene Glycol
- solvent
- humectant
-
12
Sodium Coco Pg-Dimonium Chloride Phosphate
- conditioning agent
-
13
Polyquaternium-55
- conditioning agent
- film former
- polymer
-
14
VP/Dmapa Acrylates Copolymer
- film former
- polymer
-
15
Disodium EDTA
- hard-water chelator
-
16
Phenoxyethanol
- preservative
-
17
Potassium Sorbate
- preservative
-
18
Sodium Benzoate
- preservative
-
19
Benzalkonium Chloride
- conditioning agent
-
20
Fragrance
- fragrance
- declared fragrance
-
21
Benzyl Benzoate
- fragrance
- named fragrance allergen
-
22
Limonene
- fragrance
- named fragrance allergen
-
23
Benzyl Salicylate
- fragrance
- named fragrance allergen
-
24
Benzyl Alcohol
- preservative
- solvent
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.
The Shield Anti-Humidity Spray
Lightweight, invisible heat protecting and style extending spray
Partly supportedSold for hot tools; untestable here.Protects against frizz and humidity for 24+ hours (claimed clinically proven)
Stated by brandOnly the brand’s testing shows this.Protects hair from heat styling up to 450F / 230C
Partly supportedSold for hot tools; untestable here.
Heated.Defense
Protect your hair against daily life's biggest aggressor, heat damage
Stated by brandCan’t be confirmed from label.A weightless and invisible leave-in treatment foam to protect your hair against damage associated with heated and mechanical tools
Partly supportedDepends how fine your hair is.Providing heat protection up to 232C / 450F
Partly supportedSold for hot tools; untestable here.
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.
The Shield Anti-Humidity Spray
Mane Addicts named it a top anti-frizz heat protectant: "the award for best anti-frizz heat protectant goes to amika"
Vice described it as a humidity/frizz rescue product for summer: "the tiny angel on your shoulder" / "This magic anti-humidity spray saved my hair from summer frizz hell"
Refinery29 highlighted its frizz control and hold: "Say goodbye to frizz with a smoothing spray that keeps your style in place"
Heated.Defense
Lightweight foam protects hair through repeated heat styling
SalonCentric reviewersLeaves curls or thick hair soft, shiny, and healthy
Haircare NZ and Walmart reviewersSome reviewers report little difference after styling
SalonCentric reviewerPrice 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.
Heated.Defense
Against 553 heat protectants with a computable unit price.
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.
The Shield Anti-Humidity Spray · Heated.Defense · 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.
- 8 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.
Still unsure? Take your consultation or browse more products.
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