#1 Smoothing Serum Sold in Salons (Kline data Q3 2024-Q2 2025)
A sales or award claim. It says nothing about what is in the bottle.
—
Stated by brand
Popularity, not performance.
Paul Mitchell
Super Skinny Serum
Heat protectant / Lotion, heat-protecting
- Heat protectant
- serum
- Also a finisher
- Sulfate-free
- Protein-free
- Cruelty-free · PETA-listed
Size5.1 fl oz
Price$12seen at one store · 5.1 oz
Price / oz$4.17/ozat 5.1 oz
Where to buy3 stores · $12.00–30.49
Scent:
The ingredient list declares fragrance. What it smells of is not stated, and we do not guess.
Manufacturer page: paulmitchell.com
Personal fit
Is this right for you?
Complete the consultation to see exactly how well this product fits your hair and your goals. With 2,400+ products in our library we can match exactly the right products to you.
- In 10 minutes we can identify your exact hair condition and traits.
- Every product matched against your hair across the 20 factors we check.
- A personalized routine for your daily life — your schedule, styling habits, and local weather.
- Find products that do the same job at a lower cost.
- Your goals, scalp, damage history, water, budget, and scent preferences all shape your plan.
$49.00 one-time consultation, no subscription
Add the optional $49/year membership for unlimited adjustments for changes in weather and lifestyle.
Factor
Your profile
Fit
Best for hair types
Straight–Curly
Not in your profile
Moisture level
None found
Not in your profile
Heat protection
High
Not in your profile
Slip / detangling
Some
Not in your profile
Weight on hair
Medium
Not in your profile
Fragrance
Prominent
Not in your profile
Protein
None
Not in your profile
Silicone / wax buildup
High
Not in your profile
Clarifying wash needed
Moderate
Not in your profile
Parabens / preservatives
None of these listed
Not in your profile
Show all 20 factors we check
The rest of what your plan weighs on this product.
Essential oils
Present
Not in your profile
Fast-drying alcohol
None
Not in your profile
Vegan / cruelty-free
Cruelty-free · PETA-listed
Not in your profile
Animal-derived ingredients
Not yet verified
Not in your profile
Heavy humectants
Not heavy
Not in your profile
Hard-water defence
None
Not in your profile
UV filter
None listed
Not in your profile
Ingredient list
16 ingredientsAbout average
Not in your profile
Price tier
Salon
Not in your profile
Where to buy it
Brand websiteOne channel
Not in your profile
The consultation builds your hair profile, then reads every factor in this table against it — and tells you where this product fits, or what to use instead.
Start your consultation$49.00 once, for your consultation and hair profile. No subscription, no required purchases.
Your avoid-list
Priced with its peers
$4.17/oz at 5.1 oz — less than 63% of the 564 heat protectants , which mostly run $2.82–10.20/oz.
Great for
Heat stylingthe brand states protection to 450°F
Protein-sensitive hairthat stiffens when protein is added
Very dry hairno fast-drying alcohol in the list
A wide range of haira middle-of-the-range weight
Maybe skip if
this product carries a scent
Curly-method routinesthese silicones need a detergent to remove
Tight budgetsit sits in the upper price tiers
Picking it up locallywe have it recorded in one channel only
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
Medium
Middle of the range — noticeable on fine hair, light on coarse hair.
Slip and detangling
Some
Some slip, mostly from esters or silicones rather than conditioners.
Needs detergent to remove
Yes
Water-insoluble silicones or waxes: a detergent wash is what removes them.
Water-binding (humectants)
None found
No humectants found — nothing here pulls water into the hair.
Fast-drying alcohol
None
No fast-drying alcohol in the list.
Fragrance
Prominent
Fragrance sits in the first eight ingredients — a larger share of the formula.
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.
| Ingredient | What it does | Why it matters | Chip |
|---|---|---|---|
| Isododecane | solvent | The base everything else is dissolved in | Softens |
| Dimethicone | silicone | Spreads heat across the strand | Buildup |
| Dimethiconol | silicone | Spreads heat across the strand | Buildup |
| FragranceFragrance (Parfum) | fragrance | The scent | Fragrance |
| Hexamethylindanopyran | fragrance | The scent | Fragrance |
| Hexyl Cinnamal | fragrance | The scent | Fragrance |
| Benzyl Salicylate | fragrance | The scent | Fragrance |
| Linalool | fragrance | The scent | Fragrance |
| Limonene | fragrance | The scent | Fragrance |
| Citrus Aurantium Peel Oil | botanical extract | A trace plant extract | Fragrance |
| Geraniol | fragrance | The scent | Fragrance |
| Dimethyl Phenethyl Acetate | fragrance | The scent | Fragrance |
What the list leaves out, and what it carriesThe list carries no sulfates or drying alcohols. No protein — a moisture formula, not a repair one. Fragrance is on the label. Water-insoluble silicones — needs a detergent wash to remove.
Full ingredient list (16)
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
Isododecane
General function
A fast-evaporating carrier that lets oils and polymers spread thinly, then leaves nothing behind.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
PubChemMay suitFrizz-prone, damaged, or high-friction hairEmollients fill and smooth the surface of the strand, which lowers the friction that lifts the cuticle and reads as roughness.
- solvent
- emollient
-
2
Dimethicone
General function
The most common conditioning silicone. It coats the strand for shine, slip, and frizz control, and needs a detergent (not just water) to wash out.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
May suitClimate-sensitive or frizz-prone hairA 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 hairLays a smooth film along the cuticle, which lowers combing friction and flattens the surface irregularities that read as frizz.
May not suitBuild-up-sensitive routinesDimethicone does not disperse in water. On a routine that skips detergent it stays on the hair and accumulates wash after wash.
- silicone
- emollient
- conditioning agent
-
3
Dimethiconol
General function
A high-shine silicone often paired with dimethicone for a smoother, glossier finish.
Leading ingredientListed in the first three ingredients, it is likely a structural part of this formula.
PubChemMay suitClimate-sensitive or frizz-prone hairA 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 hairLays a smooth film along the cuticle, which lowers combing friction and flattens the surface irregularities that read as frizz.
May not suitBuild-up-sensitive routinesDimethicone does not disperse in water. On a routine that skips detergent it stays on the hair and accumulates wash after wash.
- silicone
- emollient
- ▾Below about this point, order stops being meaningful — these are typically used at 1% or less.
-
4
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 zoneIt 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 routinesDeclared fragrance. On a fragrance-sensitive routine this is the line that decides it, wherever it sits on the label.
- fragrance
- declared fragrance
-
5
Hexamethylindanopyran
General function
A synthetic musk used as a long-lasting fragrance base note.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesDeclared fragrance. On a fragrance-sensitive routine this is the line that decides it, wherever it sits on the label.
- fragrance
-
6
Hexyl Cinnamal
General function
A jasmine-like fragrance component named separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
7
Benzyl Salicylate
General function
A soft floral fragrance component listed separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
8
Linalool
General function
A floral fragrance component listed separately as a recognised contact allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
9
Limonene
General function
A citrus-smelling fragrance component that EU rules require to be named separately because some people react to it.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
10
Citrus Aurantium Peel Oil
General function
A cold-pressed orange peel oil used for scent. Citrus oils are naturally high in limonene.
Estimated lower-concentration zoneIt 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 routinesEssential oils are fragrance. Several carry constituents on the EU list of declared fragrance allergens, so a label with no fragrance line can still be a scented product.
- botanical extract
- essential oil
- fragrance
-
11
Geraniol
General function
A rose-scented fragrance component, listed on its own because some people react to it.
Estimated lower-concentration zoneIt 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 routinesOne 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.
- fragrance
- named fragrance allergen
-
12
Dimethyl Phenethyl Acetate
General function
A fresh, floral fragrance component.
Estimated lower-concentration zoneIt 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 routinesDeclared fragrance. On a fragrance-sensitive routine this is the line that decides it, wherever it sits on the label.
- fragrance
-
13
Amyl Cinnamal
General function
A jasmine-like fragrance component named separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
14
Citronellol
General function
A rose-like fragrance component named separately as a recognised allergen.
Estimated lower-concentration zoneIt appears around or below the estimated 1% line, where label order no longer indicates relative amount; its role may be minor or technical.
PubChemMay not suitFragrance-sensitive routinesOne 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.
- fragrance
- named fragrance allergen
-
15
Linalyl Acetate
General function
A lavender-like fragrance component, related to linalool and listed for the same allergen reason.
Estimated lower-concentration zoneIt 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 routinesOne 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.
- fragrance
- named fragrance allergen
-
16
acetyl cedrene
General function
An individual aroma chemical. It is part of the product's fragrance; brands that print these are disclosing more of the blend than the rules require.
Estimated lower-concentration zoneIt 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 routinesDeclared fragrance. On a fragrance-sensitive routine this is the line that decides it, wherever it sits on the label.
- fragrance
What the whole list adds up to
- 13 fragrances
- 8 named fragrance allergens
- 3 emollients
- 2 silicones
- 1 solvent
- 1 conditioning agent
- 1 declared fragrance
- 1 botanical extract
- 1 essential oil
Ingredient list captured 2026-08-23. Formulas change — check the package in your hand when an ingredient matters to you.
Price · 5.1 oz
Seen at
$12
Show the price ladder
Where we’ve seen it3 listings · 3 stores
-
John Paul Mitchell Systems
$12.005.1 oz · $2.35/ozAug 30Lowest per oz
-
CVS
$30.495.1 oz · $5.98/ozAug 30
-
Ulta Beauty
$30.005.1 ozAug 23
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
- 5.1 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.
- Seen at $12 is the price we have observed for the 5.1 oz. We need three stores before we call a price commonly seen.
- About $31 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
7
Formula score
7 of 10
Nothing separates this from the middle of the range for heat protectants, on formula or on cost per ounce.
How the score is counted
- 3 products that do the same job cost less per ounce
- Costs less per ounce than 63% of the 564 heat protectants we’ve priced
- No humectant in the formula
- 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.
Paul MitchellFragrance-free
Clear Smoothing Serum (Blowout Primer)
$2.35/oz $1.82/oz less
- Fragrance-free
- Unscented
- Protein-free
- Differs
Design EssentialsClose function
Agave & Lavender Serum
$2.25/oz $1.92/oz less
- Protein-free
- Shine
- Alcohol-free
- Function
- Also
ORSLowest cost per oz
Olive Oil Thermalast 2-N-1 Shine Mist and Heat Defense
$1.95/oz $2.22/oz less
- Heat protect
- Protein-free
- Rich
- Function
- Also
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
Final decision
Should you buy it?
Good for the right personBest user
People who blow-dry or flat-iron who want heat protection and a protein-free formula
Biggest tradeoff
Not ideal for anyone sensitive to fragrance, curly-method routines, or people shopping on a budget
Best alternative if not
Paul Mitchell Clear Smoothing Serum (Blowout Primer), for similar results at a lower price
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.
1
SupportedBacked by ingredients
0
Partly supportedSome supporting logic
5
Stated by brandNo clear evidence
0
Potential conflictFormula works against claim
Best-selling blowout primer protects from heat with reduced drying time
A sales or award claim. It says nothing about what is in the bottle.
—
Stated by brand
Popularity, not performance.
One Super Skinny Serum is sold every 20 seconds
This is a marketing claim; an ingredient list cannot speak to it.
—
Stated by brand
Can’t be confirmed from label.
Humidity-resistant formula protects against frizz
Humidity resistance is measured in a lab, not read off a label; film formers can help.
- Dimethicone
- Dimethiconol
Stated by brand
May help, but not measurable here.
Lightweight silicones coat and seal each strand
Silicones or film formers smooth the cuticle, which is the usual mechanism.
- Dimethicone
- Dimethiconol
Supported
Smoother strands, less frizz.
Very concentrated, use sparingly
This is a marketing claim; an ingredient list cannot speak to it.
—
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.
Controls stray hair and frizz without grease for some users
Jules, Ulta reviewerSmooths hair and improves shine with a small amount
Ulta reviewersCurrent formula can feel oily, sticky, or have an altered scent
Jerky, kjok1212, and Jane, Ulta reviewersMore from Paul Mitchell
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 16 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.