Skip to main content

Side by side

Biolage Smooth Proof Deep Treatment Hair Mask vs Olaplex Weightless Nourishing Mask

92% function match · 8 of the 10 functions we compared match Formula overlap 46%. Biolage Smooth Proof Deep Treatment Hair Mask and Olaplex Weightless Nourishing Mask share 4 ingredients among each other's most prominent.

Based on your consultation

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
  • Your answers appear here

When each one is the right call

What each formula is built for, from its own ingredient list.

  • Smooth Proof Deep Treatment Hair Mask — protein-sensitive hair
  • Weightless Nourishing Mask — protein-sensitive hair

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”.

Trait
Biolage Smooth Proof Deep Treatment Hair Mask — brand photograph Biolage

Smooth Proof Deep Treatment Hair Mask

  • Mask / treatment
  • Salon
  • Sulfate-free
  • Protein-free
Olaplex Weightless Nourishing Mask — 6.76 oz container Olaplex

Weightless Nourishing Mask

  • Mask / treatment
  • Salon
  • Sulfate-free
  • Protein-free
Price, size & price per ounce
$17 3.3 oz · $5.59/oz
$44–51 6.76 oz · $6.51/oz

Compared at different sizes — 6.76 oz against 3.3 oz. Per-ounce prices favour the larger bottle.

Value / price positioning
Upper-mid price for a treatment $$$$$ Salon tier · costs more than 73% of the 354 masks and treatments we’ve priced
Same job for less elsewhere $$$$$ Salon tier · costs more than 81% of the 354 masks and treatments we’ve priced
Best for hair types
All types Nothing in the formula or the claims narrows this to one pattern. Your hair
All types Nothing in the formula or the claims narrows this to one pattern. Your hair
Moisture level Same
Moderate Humectants in the working part of the formula. Your hair
Moderate Humectants in the working part of the formula. Your hair
Time on the hair
Short A short wait — it fits inside an ordinary shower. Your hair
—
Slip / detangling Same
High Conditioning agents sit high in the list — this is a detangling formula. Your hair
High Conditioning agents sit high in the list — this is a detangling formula. Your hair
Weight on hair Same
Medium Middle of the range — noticeable on fine hair, light on coarse hair. Your hair
Medium Middle of the range — noticeable on fine hair, light on coarse hair. Your hair
Fragrance
Prominent Fragrance sits in the first eight ingredients — a larger share of the formula. Your hair
Present Fragrance is listed; it sits below the working ingredients. Your hair
Protein Same
None No protein or amino acids in the list. Your hair
None No protein or amino acids in the list. Your hair
Silicone / wax buildup Same
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
High Water-insoluble silicones or waxes: a detergent wash is what removes them. Your hair
Clarifying wash needed
Moderate Your hair
Moderate Your hair
Oils and butters Same
Present, lower down Oils are present, but low enough to be a finishing touch. Your hair
Low Oils are present, but low enough to be a finishing touch. Your hair
Formula completeness
out of 10
Covers the core
out of 10
Covers the core
Who should choose this
  • Protein-sensitive hairthat stiffens when protein is added
  • Maximum slipfor hair that tangles the moment it is wet
  • Dry, thirsty hairhumectants and emollients both sit up front
  • Porous, damaged hairceramides are in the list
  • Protein-sensitive hairthat stiffens when protein is added
  • Maximum slipfor hair that tangles the moment it is wet
  • Dry, thirsty hairhumectants and emollients both sit up front
  • Cuticle-smoothing pHa pH adjuster brings it to the acidic range hair prefers
Why you might skip it
  • Scents bother youthis product carries a scent
  • Curly-method routinesthese silicones need a detergent to remove
  • Very dry or damaged hairit contains fast-drying alcohol
  • Scents bother youthis product carries a scent
  • Curly-method routinesthese silicones need a detergent to remove
  • Very dry or damaged hairit contains fast-drying alcohol
from the formula stated by the brand reported by reviewers Scale: 1 dot low · 5 dots high, within this product type.
More facts about each one
Type
Mask / treatment
Mask / treatmentcream
Where to buy
Salons · Brand website
Brand website · Specialty beauty
Free of
  • sulfate-free
  • protein-free
  • sulfate-free
  • protein-free
Vegan
Vegan · label states
—
Scent
Scented, not described
Scented, not described
Time on hair
3–5 min
—
How often
weekly
weekly
Treatment focus
smoothing
—

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.

Take the consultation

$49.00 once, for your consultation and hair profile. No subscription, no required purchases.

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

IngredientSmooth Proof Deep Treatment Hair MaskWeightless Nourishing Mask
Water
Neutral
#1Leading
#1Leading
Cetearyl Alcohol
Softens
#2Leading
#4Supporting
Behentrimonium Chloride
Detangles
#3Leading
#5Supporting
Amodimethicone
Buildup
#4Supporting
#12Secondary
Cetyl Esters
Softens
#6Supporting
#30Below the 1% line
Glycerin
Moisturizes
#7Supporting
#11Secondary
Fragrance
Fragrance
#8Below the 1% line
#13Below the 1% line
Isopropyl Alcohol
Drying
#9Below the 1% line
#18Below the 1% line

What only one of them carries

Smooth Proof Deep Treatment Hair Mask

Weightless Nourishing Mask

Full ingredient list — Smooth Proof Deep Treatment Hair Mask (25)
Full ingredient list — Weightless Nourishing Mask (58)

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.

VerdictsSmooth Proof Deep Treatment Hair MaskWeightless Nourishing Mask
Supported
1
0
Partly supported
0
0
Stated by brand
2
5
Potential conflict
0
0

Smooth Proof Deep Treatment Hair Mask

  • 8X smoother hair vs. non-conditioning shampoo when used as a systemStated by brandOnly the brand’s testing shows this.
  • up to 70% less breakage with each use (used with Biolage shampoo)Stated by brandOnly the brand’s testing shows this.
  • controlled frizz with softer, more manageable resultsSupportedEasier detangling, less breakage.

Weightless Nourishing Mask

  • 2X HYDRATION INSTANTLYStated by brandOnly the brand’s testing shows this.
  • 2X VOLUME INSTANTLY AND ALL DAYStated by brandOnly the brand’s testing shows this.
  • 63% MORE SHINEStated by brandOnly the brand’s testing shows this.
  • UP TO 5 WASHES 75% HYDRATION RETENTIONStated by brandOnly the brand’s testing shows this.
  • REDUCES AND PREVENTS BREAKAGEStated by brandCan’t be confirmed from label.

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.

Both praised for frizz control. Olaplex Weightless Nourishing Mask draws complaints about tangling and residue or cast.

Smooth Proof Deep Treatment Hair Mask

A verified buyer reports shiny, silky results.

Nicky Mishra, Myntra verified buyer; Jul 2024

Verified buyers report smoother, fragrant, and less frizzy hair.

Anjali, Myntra verified buyer; Feb 2023

A repeat verified buyer reports the mask works well on damaged and chemically treated hair.

Martina, Myntra verified buyer; Aug 2023

An independent reviewer reports no noticeable smoothing or moisture and rough, dry hair; exact US listing is currently out of stock.

Niharika Verma, Pink Velvet Blog; Oct 2024; Walmart listing out of stock

Weightless Nourishing Mask

Reviewers report noticeably softer, shinier and less frizzy hair immediately after a single use

fine to medium hair users

A minority of reviewers say the mask leaves hair dry, tangled or coated with residue despite the weightless marketing

mixed hair types

The whipped, silicone-forward texture reads as lighter than a typical creamy mask, which some reviewers found surprising given the name

reviewers comparing to traditional richer masks

Price 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.

$5.59/oz vs $6.51/oz — Olaplex Weightless Nourishing Mask costs about 1.2× more per ounce than Biolage Smooth Proof Deep Treatment Hair Mask.

$0.19/oz median $3.64/oz $24.50/oz $5.59/oz Smooth Proof Deep Treatmen $6.51/oz Weightless Nourishing Mask

Every mark sits on one distribution because these are compared against the same set: 354 masks and treatments with a computable unit price.

Value readSmooth Proof Deep Treatment Hair MaskWeightless Nourishing Mask
Label
Upper-mid price for a treatmentSits in the middle of the range for masks and treatments per ounce.
Same job for less elsewhereYou are paying above the range for a formula close to several lower-priced options.

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.

Smooth Proof Deep Treatment Hair Mask vs Color Last Deep Treatment Pack Hair MaskBiolage · 100% function matchWeightless Nourishing Mask vs Nutricurls Deep Treatment Waves & Curls MaskWella Professionals · 96% function matchSmooth Proof Deep Treatment Hair Mask vs Tea Tree Oil Revitalizing MasqueCHI · 96% function matchWeightless Nourishing Mask vs ColorMotion+ Structure MaskWella Professionals · 96% function matchSmooth Proof Deep Treatment Hair Mask vs Total Repair 5 Damage-Erasing BalmL'Oreal Paris Elvive · 95% function matchWeightless Nourishing Mask vs Tea Tree Oil Revitalizing MasqueCHI · 96% function matchSmooth Proof Deep Treatment Hair Mask vs Whole Blends Honey Treasures Repairing MaskGarnier · 95% function matchWeightless Nourishing Mask vs Hydra Gloss Sulfate-Free 5-Min Hair GlossSuave · 92% function match

Smooth Proof Deep Treatment Hair Mask · Weightless Nourishing Mask · All masks and treatments 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.
  • 11 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.

Your personalized hair plan

Tell us what’s going on with your hair, see what we understand, and get a plan built around it — with the reason behind every recommendation.

Free to start · $49.00 for your consultation and hair profile · No subscription · Nothing you must buy

Start your consultation