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Bumble and bumble

Prep Primer for Ultra Fine Hair

Leave-in / Light leave-in, lightweight

  • Leave-in
  • spray
  • Detangler
  • Sulfate-free
  • Protein-free
  • Moisture-rich
  • Cruelty-free · PETA-listed
Size8.5 fl oz
Price$34seen at one store · 8.5 oz
Price / oz$4.00/ozat 8.5 oz
Where to buy1 store

Scent:

Notes: fresh.

Strength: Light

Personal fit

Is this right for you?

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Upper-mid price for a leave-in

$4.00/oz at 8.5 oz — more than 64% of the 477 leave-ins , which mostly run $1.17–5.50/oz. The cost less.

Price and stores

Great for

Protein-sensitive hairthat stiffens when protein is added
Dry, thirsty hairhumectants and emollients both sit up front
Curl definitionfilm formers hold a clump together
Fine hairthat flattens under most products
Very dry hairno fast-drying alcohol in the list
Cuticle-smoothing pHa pH adjuster brings it to the acidic range hair prefers

Maybe skip if

this product carries a light scent
Curly-method routinesthese silicones need a detergent to remove
Hair that needs proteinthere is none in this list
Coarse, very dry hairthis is a light formula for its category
Tight budgetsit sits in the upper price tiers

Whether this weight sits well on your hair depends on density, porosity, and how much you already layer — 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.

Weight on the hair Light

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

Slip and detangling Moderate

Conditioning agents are present, lower in the list.

Water-binding (humectants) Moderate

Humectants in the working part of the formula.

Oils and butters Present, high in the list

Oils sit high in the list — a softening, coating formula.

Protein None

No protein or amino acids in the list.

Needs detergent to remove Yes

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

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
Water solvent The base everything else is dissolved in Neutral
Ascophyllum Nodosum Extract botanical extract A plant extract, marketed as much as functional Neutral
Humulus Lupulus Extract botanical extract A plant extract, marketed as much as functional Neutral
Macrocystis Pyrifera Extract botanical extract A plant extract, marketed as much as functional Neutral
Rosmarinus Officinalis (Rosemary) Leaf ExtractRosmarinus Officinalis Leaf Extract botanical extract A trace plant extract Stabilizes
Carthamus Tinctorius (Safflower) Seed OilCarthamus Tinctorius Seed Oil oil A small amount of oil for softness Softens
Tocopheryl Acetate antioxidant Protects the formula Stabilizes
Glycerin humectant Adds a little water-binding Moisturizes
Amodimethicone silicone A little smoothing and shine Buildup
Limonene fragrance The scent Fragrance
Fragrance fragrance The scent Fragrance
What the list leaves out, and what it carriesNo sulfates or drying alcohols. Protein-free: this is built for moisture rather than for strengthening. Contains fragrance. The silicones here need a detergent wash to come off.
Full ingredient list (25)

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
    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 Ascophyllum Nodosum Extract
    General function

    A seaweed extract used at low levels for mineral claims.

    Leading ingredient

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

    • botanical extract
  • 3 Humulus Lupulus Extract
    General function

    An extract of Humulus Lupulus. Plant extracts are used across a wide range of levels, and label order is the best guide to how much is here.

    Leading ingredient

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

    • botanical extract
  • 4 Macrocystis Pyrifera Extract
    General function

    An extract of Macrocystis Pyrifera. Plant extracts are used across a wide range of levels, and label order is the best guide to how much is here.

    Supporting ingredient

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

    • botanical extract
  • Below about this point, order stops being meaningful — these are typically used at 1% or less.
  • 5 Rosmarinus Officinalis (Rosemary) Leaf Extract · Rosmarinus Officinalis Leaf Extract
    General function

    Rosemary extract, used both as a scent note and as a natural antioxidant in scalp products.

    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.

    • botanical extract
    • antioxidant
  • 6 Carthamus Tinctorius (Safflower) Seed Oil · Carthamus Tinctorius Seed Oil
    General function

    A light oil that softens without much residue.

    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

    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.

    • oil
    • emollient
  • 7 Tocopheryl Acetate
    General function

    A stable form of vitamin E used to keep the oils in a formula from oxidising. It is used at fractions of a percent.

    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.

    PubChem
    • antioxidant
    • vitamin
  • 8 Glycerin
    General function

    A small water-loving molecule that draws moisture into the hair and holds it there. It is the most common softening ingredient in conditioners and leave-ins.

    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

    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
  • 9 Biotin
    • vitamin
  • 10 Cysteine
    General function

    A sulfur amino acid from hair protein, used in repair-positioned formulas.

    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

    Amino acids are the smallest protein fraction and bind water as well, so they add far less stiffness than a hydrolysed protein does.

    DependsProtein-sensitive hair

    The lightest option in the protein family, but still protein — worth watching if protein reliably stiffens your hair.

    • amino acid
  • 11 Retinyl Palmitate
    • vitamin
    • antioxidant
  • 12 Linoleic Acid
    General function

    An essential fatty acid found in most plant oils, used for softness and to support the hair's surface lipids.

    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

    Emollients fill and smooth the surface of the strand, which lowers the friction that lifts the cuticle and reads as roughness.

    • emollient
  • 13 Gluconolactone
    General function

    A gentle acid that holds water and helps loosen surface build-up. It also binds a little hard-water mineral.

    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

    Binds the calcium and magnesium in hard water, which is what stops mineral deposits accumulating on the strand wash after wash.

    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 suitGray, silver, or brass-prone hair

    Copper and iron carried in tap water deposit on the strand and read as a dull, warm cast on gray or light hair. A chelator holds those metals in solution so the wash carries them off.

    PubChem
    • humectant
    • exfoliant
    • hard-water chelator
  • 14 Linolenic Acid
    General function

    An omega-3 fatty acid from plant oils, used for softness at low levels.

    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

    Emollients fill and smooth the surface of the strand, which lowers the friction that lifts the cuticle and reads as roughness.

    • emollient
  • 15 Amodimethicone
    General function

    A silicone modified to stick where hair is damaged, so it smooths selectively instead of coating everything. It resists rinsing more 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

    Amino-functional silicone carries a positive charge, so it binds where the cuticle is worn rather than coating evenly. Damaged areas get most of it.

    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.

    International Journal of Trichology
    • silicone
    • conditioning agent
    • film former
  • 16 Distearyldimonium Chloride
    General function

    A rich conditioning agent used in heavier masks for detangling and a coated, smooth feel.

    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

    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
  • 17 Calcium Gluconate
    General function

    A mineral salt used in trace amounts to stabilise the formula.

    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

    Binds the calcium and magnesium in hard water, which is what stops mineral deposits accumulating on the strand wash after wash.

    May suitGray, silver, or brass-prone hair

    Copper and iron carried in tap water deposit on the strand and read as a dull, warm cast on gray or light hair. A chelator holds those metals in solution so the wash carries them off.

    PubChem
    • hard-water chelator
    • salt
  • 18 Isoceteth-20
    • emulsifier
    • solubilizer
  • 19 Cetrimonium Chloride
    General function

    A quick-acting conditioning agent that reduces static and combing force. It also helps keep the formula stable.

    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

    The C16 quat binds mostly by charge rather than by chain, so it deposits measurably less than the C22 ones. Less deposit is less conditioning and also less weight, which is usually the trade fine hair wants.

    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.

    DependsBuild-up-sensitive routines

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

    International Journal of Cosmetic Science
    • conditioning agent
    • cleanser
  • 20 Trideceth-10
    • emulsifier
    • solubilizer
  • 21 Disodium EDTA
    General function

    Grabs metal ions from hard water so they cannot dull the hair or destabilise the formula.

    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

    Binds the calcium and magnesium in hard water, which is what stops mineral deposits accumulating on the strand wash after wash.

    May suitGray, silver, or brass-prone hair

    Copper and iron carried in tap water deposit on the strand and read as a dull, warm cast on gray or light hair. A chelator holds those metals in solution so the wash carries them off.

    PubChem
    • hard-water chelator
  • 22 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
  • 23 Sodium Benzoate
    • preservative
  • 24 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 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
  • 25 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 botanical extracts
  • 4 hard-water chelators
  • 3 antioxidants
  • 3 emollients
  • 3 vitamins
  • 2 humectants
  • 2 conditioning agents
  • 2 emulsifiers
  • 2 solubilizers
  • 2 fragrances
  • 1 solvent
  • 1 oil
  • 1 amino acid
  • 1 exfoliant

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

Price · 8.5 oz

Seen at $34 1 store · checked Aug 23
Good value under $20 Under $2.33/oz it costs less than three-quarters of the 6 products we score as doing the same job

Priced above the products that do the same job. Stores sell it above the $20 line; products that do this job typically go for about $39 at this size.

Show the price ladder
Where we’ve seen it1 listing · 1 store

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. 8.5 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 $34 is the price we have observed for the 8.5 oz. We need three stores before we call a price commonly seen.
  3. Good value under $20 comes from the 6 products we score as doing the same job as this one. A quarter of them cost less than $2.33/oz; at 8.5 oz that is $20. Under that line you are paying less than most of them.
  4. About $39 is what those same products typically cost at this size — the midpoint of their prices per ounce, scaled to 8.5 oz.

Formula

Formula score
7 of 10

Both the formula and the price land mid-range: it covers the core of what a leave-in does and costs about what leave-ins cost per ounce.

How the score is counted
  • 4 products we score as doing the same job cost less per ounce
  • Costs more per ounce than 64% of the 477 leave-ins we’ve priced
  • No conditioning agents up front in the formula
  • Reviewers mention 2 things they like about how it performs
  • Conditioning agents up frontWhat makes wet hair comb through.2 pts
  • A humectantBinds water into the hair.2 pts
  • A light baseWater or a volatile carrier first, so it does not weigh hair down.2 pts
  • Oils or butters in the working zoneSoftens the strand rather than just coating it.2 pts
  • No detergent-dependent filmNothing that needs a clarifying wash to remove.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.

OGXClosest function Smooth Emulsion + Argan Oil Conditioning Hair Mist $1.69/oz $2.31/oz less
  • Protein-free
  • Lightweight
  • Alcohol-free
Function
  • Water-binding (humectants)
Also
  • Drugstore tier
  • 6.5 oz bottle
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Marc AnthonyClose function Grow Long Anti-Frizz Shield Ultimate Blowout Spray $1.57/oz $2.43/oz less
  • Heat protect
  • Protein-free
  • Lightweight
Function
  • Oils and butters
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  • Drugstore tier
  • 6.7 oz bottle
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Creme of NatureLowest cost per oz Pure Honey Scalp Refresh Invigorating Leave-In $0.95/oz $3.05/oz less
  • Protein-free
  • Lightweight
  • Alcohol-free
· Close function
Function
  • Water-binding (humectants)
  • Oils and butters
Also
  • Drugstore tier
  • 8 oz bottle
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

Suits every hair pattern

Final decision

Should you buy it?

Good for the right person
Best user

Hair that stiffens on protein who want a protein-free formula and moisture that stays in

Biggest tradeoff

Less suited to anyone sensitive to fragrance, curly-method routines, or soft, over-stretchy hair that needs 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, 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
1
Stated by brandNo clear evidence
0
Potential conflictFormula works against claim
This lightweight primer and leave-in detangler sets the stage for styling and creates a great surface for styling products

Conditioning agents are present, but low in the list.

  • Amodimethicone
  • Distearyldimonium Chloride
  • Cetrimonium Chloride
Partly supported

A little slip, not a lot.

It's the first step that preps hair without weighing down even the finest strands

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

Stated by brand

Can’t be confirmed from label.

A light hair primer that detangles + preps, and then refreshes for styling

Conditioning agents are present, but low in the list.

  • Amodimethicone
  • Distearyldimonium Chloride
  • Cetrimonium Chloride
Partly supported

A little slip, not a lot.

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.

Perceived as genuinely lightweight/non-greasy, no residue

fine hair

Detangling ease most-cited benefit, especially on refresh/second-day hair

Isolated complaints about spray nozzle misfiring

Mixed reaction to scent -- pleasant/subtle to some, undetectable to others

More from Bumble and bumble

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.
  • 3 sources consulted for this product (3 manufacturer or regulatory, 0 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.