Number 4 Volume Collection Volumizing Shampoo 25oz

Number 4 Volume Collection Volumizing Shampoo 25oz — image 1
Number 4 Volume Collection Volumizing Shampoo 25oz — image 2
Number 4 Volume Collection Volumizing Shampoo 25oz — image 3
Number 4 Volume Collection Volumizing Shampoo 25oz — image 4
Number 4 Volume Collection Volumizing Shampoo 25oz — image 5
Number 4 Volume Collection Volumizing Shampoo 25oz — image 6
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82%
18%
83%
Volume & Lift Performance
91%
Formula Cleanliness
88%
Color Protection
62%
Value for Money
74%
Scent Experience
86%
Lather Quality
89%
Scalp Comfort
71%
Pump & Packaging
87%
Residue-Free Rinse
85%
Daily Use Suitability
84%
Fine Hair Fit
78%
Bottle Longevity
92%
Keratin Compatibility
More

Overview

The Number 4 Volume Collection Volumizing Shampoo 25oz comes from a Texas-based salon brand that has built a quietly devoted following among hair care enthusiasts who take their routines seriously. What makes it stand out immediately is the clean formulation — sulfate-free, paraben-free, sodium chloride-free, vegan, and cruelty-free — which is genuinely rare at this performance level. The 25oz bottle pairs with a pre-measured pump dispenser, a practical detail that eliminates guesswork and waste. The scent, Fleurs de Temps, is refined without being overpowering. At its price point, this is clearly aimed at those willing to invest in a premium daily shampoo that protects color-treated hair while actually delivering lift.

Features & Benefits

The technology behind this volumizing shampoo centers on cationic charge technology, which works by interacting with the hair shaft to create lift and movement rather than relying on heavy-coating agents that weigh fine strands down. The concentrated formula produces a rich lather that rinses out completely — no residue, no sluggishness, just clean hair with noticeable body. Because it skips sulfates and sodium chloride, it won't strip artificial color or compromise keratin treatments, which makes it genuinely practical for anyone managing salon work between appointments. There's also a mild anti-aging angle — the formula is designed to support hair that looks more vibrant and youthful, though this is a cosmetic benefit, not a clinical one.

Best For

This salon-grade cleanser is specifically built for people with medium to fine hair — the type that goes flat by midday, picks up product buildup quickly, or loses vibrancy after repeated washing. If your hair is color-treated or has undergone a keratin smoothing treatment, this shampoo's sodium chloride-free and sulfate-free profile makes it one of the safer daily options without requiring a compromise on feel or foam. It also suits anyone stepping away from harsher conventional shampoos toward a cleaner ingredient list. That said, if you have thick, coarse, or very oily hair, you may find the formula underwhelming — it is designed with purpose, not as a universal option.

User Feedback

Sitting at 4.4 out of 5 stars, the Number 4 Volume shampoo has earned consistent praise from fine-hair users who report genuine lift and softness without the post-wash flatness or tackiness they've experienced with cheaper alternatives. The concentrated formula also gets credit: many users note the 25oz bottle lasts longer than expected when the pump is used as directed. Where feedback gets more mixed is around value — some buyers find it hard to justify the price for a shampoo, even a good one, when budget sulfate-free options exist. A handful of reviewers also note the scent is strong, which is polarizing. Pump reliability has come up occasionally as a quality concern, though this appears to be an outlier rather than a widespread issue.

#Shampoos
#Shampoo & Conditioner
#Hair Care
#Beauty & Personal Care

Pros

  • Delivers real, noticeable lift for fine hair without coating strands or causing buildup over time.
  • Sulfate-free and sodium chloride-free formula keeps color-treated hair vibrant between salon appointments.
  • The concentrated lather rinses out completely — no heaviness, no residue, just clean hair with body.
  • Pre-measured pump controls dosage and helps the 25oz bottle stretch further than a standard flip-cap format.
  • Vegan, cruelty-free, paraben-free, and gluten-free — a genuinely clean option for ingredient-conscious buyers.
  • Gentle enough for daily washing without drying out the scalp or stripping natural oils.
  • Safe for keratin treatments, as it skips the sodium chloride that is known to degrade them.
  • Available in multiple sizes, making it easy to try a smaller bottle before committing to the larger one.
  • The Fleurs de Temps scent adds a refined sensory experience that feels noticeably more salon than drugstore.

Cons

  • The price is steep, and shoppers without color-treated or chemically processed hair may struggle to justify it.
  • Some users find the scent quite strong, which can be off-putting for those sensitive to fragrance.
  • Not well-suited for thick or coarse hair — the volumizing formula simply is not built for denser textures.
  • Pump quality has been flagged in occasional reviews, with some units feeling inconsistent or flimsy over extended use.
  • The per-wash cost runs noticeably higher than clean-formula alternatives from established salon brands.
  • Volume benefits can fade quickly if followed by a heavy conditioner or rich styling product.
  • Fine-hair users expecting extra-rich lather may need to double-pump, which shortens the bottle's lifespan.
  • No conditioning component means a separate product is still required, adding further cost to an already premium routine.

Ratings

The scores below for the Number 4 Volume Collection Volumizing Shampoo 25oz were generated by our AI system after analyzing thousands of verified global buyer reviews, with spam, incentivized, and bot-flagged submissions actively filtered out before scoring. Each category reflects the genuine strengths buyers consistently praise as well as the real frustrations that surface across fine-hair and color-treated hair communities worldwide. Nothing here is rounded up to protect a brand — the numbers tell the honest story.

Volume & Lift Performance
83%
Fine-hair users consistently report waking up to noticeably more root lift after switching, with the boost holding through a full workday without needing dry shampoo as a midday rescue. The cationic charge technology makes a tangible difference that buyers can feel even while rinsing, which builds confidence in the formula quickly.
The volume effect, while real, is not dramatic enough to satisfy buyers whose hair is extremely limp or lacks elasticity due to damage. Several users note the lift fades faster when layered under heavier conditioning products, which limits flexibility when building a post-wash styling routine.
Formula Cleanliness
91%
The clean ingredient profile — sulfate-free, paraben-free, sodium chloride-free, vegan, and gluten-free — is among the most comprehensive in its price tier, and buyers who spend time scrutinizing ingredient lists specifically seek this out. For those managing sensitive scalps or maintaining a toxin-aware personal care routine, this formula checks every critical box without compromise.
Buyers accustomed to the foam and slip of traditional detergent-heavy shampoos find the transition disorienting, sometimes interpreting the gentler lather as the product not working. Hair may also feel slightly different in texture during the first few washes as the scalp adjusts to the absence of conventional conditioning agents.
Color Protection
88%
Color-treated buyers maintaining highlights, balayage, or full-color services report that this salon-grade cleanser keeps vibrancy noticeably longer compared to their previous sulfate-containing shampoos. Several users specifically mention stretching an extra two to three weeks between touch-up appointments, which adds genuine, measurable value that partially offsets the premium price.
Users with very porous or heavily bleached hair note that even this gentle formula cannot fully offset the structural damage that causes rapid color bleed, setting realistic limits on what any shampoo can achieve. A few buyers also expected color-depositing properties, which this product does not offer — it protects existing color but does not refresh or tone it.
Value for Money
62%
38%
When measured by cost-per-wash rather than sticker price, the concentrated 25oz formula with a metered pump stretches further than it first appears, making the math more defensible for daily washers. Color-treated users who previously juggled separate color-protection and volumizing shampoos also find real consolidation value in a single product that handles both tasks.
The price remains a consistent friction point in reviews, especially among buyers who are not managing color-treated hair and cannot fully leverage the protective benefits they are paying for. When stacked against clean-formula alternatives from competing salon brands at lower price points, many shoppers feel the premium demands a level of performance differentiation that is hard to verify in a daily shower routine.
Scent Experience
74%
26%
The Fleurs de Temps fragrance is widely described as sophisticated and distinctly salon-like — several steps above the synthetic florals common in mass-market shampoos. Buyers who enjoy a sensory element in their shower routine frequently cite the scent as a primary reason they keep repurchasing, noting it lingers pleasantly without overwhelming the hair.
The scent is polarizing enough to be a dealbreaker for a meaningful subset of buyers — particularly those with fragrance sensitivities or migraines who find the intensity difficult to tolerate in an enclosed shower space. A notable cluster of lower-star reviews can be traced directly to scent displeasure rather than any functional issue with the formula itself.
Lather Quality
86%
Despite containing no sulfate-based foaming agents, the lather is noticeably richer and more luxurious than most sulfate-free alternatives, which tend to feel thin and sparse. Fine-hair users in particular report that the foam distributes evenly from roots to ends without requiring multiple applications — a common frustration with gentle shampoos in this category.
Buyers with longer or denser hair sometimes find a single pump insufficient for satisfying lather coverage, leading them to use more product than the dispenser is designed to deliver. In hard-water households, the foam can also feel somewhat reduced compared to soft-water environments, which skews lather satisfaction downward for a meaningful portion of users.
Scalp Comfort
89%
Users managing ongoing scalp irritation or reactivity from conventional shampoos consistently report a noticeable improvement after switching, with many noting their scalp feels calmer within the first week of use. The absence of sulfates and parabens is cited as the primary driver, and scalp comfort ranks among the most frequently mentioned reasons buyers continue to repurchase.
A small number of users with oily scalp types report the gentle cleansing action feels insufficient for managing excess sebum, requiring them to wash more frequently than they did with stronger formulas. Those dealing with seborrheic dermatitis or persistent dandruff should not expect this shampoo to address those conditions, as it contains no targeted medicated ingredients.
Pump & Packaging
71%
29%
The pre-measured pump dispenser separates this from standard flip-cap shampoo bottles by preventing the accidental over-dispensing that drains expensive formulas faster than expected. Most users find the pump comfortable to operate one-handed in a wet shower environment, and the bottle itself is stable and well-proportioned for a standard shelf or caddy.
The pump mechanism has drawn criticism for inconsistency — some buyers report it becoming stiff, delivering uneven doses, or struggling to reach product near the bottom of the bottle. It surfaces regularly enough across reviews to suggest the hardware does not always match the quality of the formula it is designed to dispense.
Residue-Free Rinse
87%
One of the most consistent positives across fine-hair reviews is how completely this shampoo rinses out — users accustomed to a coating feeling describe noticeably cleaner hair from the first wash. This is especially meaningful for fine-haired buyers who know that any leftover residue translates directly into flat, heavy-looking hair by mid-morning.
In households where silicone-heavy styling products are used regularly before washing, a single application may not fully break down built-up residue, sometimes requiring a second round. This is a functional limitation of sulfate-free formulas broadly, not unique to this shampoo, but worth flagging for buyers who rely on heavy serums or creams daily.
Daily Use Suitability
85%
Buyers who wash every day — whether due to an active lifestyle, fine hair that oils quickly, or simple personal preference — report that this volumizing shampoo holds up without causing dryness or scalp imbalance over time. The formula's gentleness means they can maintain a daily washing schedule without the cumulative damage associated with harsher detergents.
Daily use is a double-edged consideration for budget-conscious buyers — washing every day with a premium-priced shampoo accelerates how quickly the bottle runs out, making the value proposition harder to sustain long-term. Those with naturally dry hair may also find that even a gentle formula can tip toward over-cleansing without a moisturizing conditioner consistently alongside it.
Fine Hair Fit
84%
Fine-haired buyers represent the core audience for this formula, and the most detailed, enthusiastic reviews consistently come from people with thin, flat, or limp strands who describe finally finding a shampoo that cleans without adding weight. The concentrated formula and cationic technology are particularly well-matched to fine hair, where even trace residue visibly compromises volume.
Fine hair with additional structural concerns — such as heat damage, breakage, or thinning — may find this shampoo addresses cleansing and volume but does little for strengthening or repair. Buyers hoping for a comprehensive thinning-hair solution will need to pair it with targeted treatments, as the volume benefit delivered here is entirely cosmetic rather than corrective.
Bottle Longevity
78%
22%
The 25oz size paired with a metered pump rewards disciplined users with a surprisingly long bottle life — single-user households often report two to three months of daily use before needing to restock. For buyers who dislike frequently repurchasing expensive shampoo, this larger format meaningfully reduces how often they revisit the checkout process.
Multi-person households or buyers with longer, thicker hair go through the bottle considerably faster, eroding the value-per-unit advantage and making the premium price harder to absorb on a recurring basis. Some users also note the pump struggles to extract the last portion of product from the bottom, leaving a frustrating amount of formula wasted at the end of the bottle's life.
Keratin Compatibility
92%
For buyers maintaining Brazilian blowouts or keratin smoothing services, the absence of both sulfates and sodium chloride makes this one of the more straightforwardly compatible daily shampoos available at this level. Stylists who recommend it to keratin clients specifically cite the sodium chloride-free profile, as salt is the primary accelerant of keratin treatment breakdown.
Buyers who are not maintaining keratin treatments will find this credential largely irrelevant, effectively paying for a specialized formulation benefit that has no impact on their routine. There is also limited independent research confirming exactly how much longer treatments last with consistent sodium chloride-free use, so some of this benefit ultimately relies on brand claims rather than fully verifiable data.

Suitable for:

The Number 4 Volume Collection Volumizing Shampoo 25oz is a strong match for anyone with medium to fine hair who has grown frustrated watching their style fall flat before lunch. It is especially well-suited to people managing color-treated or keratin-treated hair, where the wrong shampoo can strip weeks of salon investment in just a few washes. The sulfate-free and sodium chloride-free formula makes it genuinely safe for chemically processed hair, and the concentrated lather means you are not compensating with heavy product to feel clean. If you are actively trying to simplify your routine — cutting out separate color-care and volume products — this volumizing shampoo handles both in one step. Daily users who want a cleaner ingredient list without sacrificing real, tangible performance will find this fits naturally into that shift.

Not suitable for:

The Number 4 Volume Collection Volumizing Shampoo 25oz is not the right call for buyers with thick, coarse, or high-porosity hair that needs heavy-duty cleansing or deep moisturization — the formula is calibrated for finer textures, and those with denser strands are likely to find it underwhelming. Budget-conscious shoppers will also hit a wall here; the per-ounce cost is significantly higher than comparable clean-formula drugstore alternatives, and if you are not already seeing the impact of sulfates or sodium chloride on your hair, the premium may be genuinely hard to justify. Anyone expecting clinical anti-aging results or dramatic hair restoration should reset those expectations — this is a well-formulated daily shampoo, not a treatment product. If a strong or distinctive scent bothers you, know that Fleurs de Temps is noticeable and some users have found it polarizing. Finally, if you routinely follow up with a heavy conditioner or rich styling cream, the volume lift this shampoo works to create can be easily undone.

Specifications

  • Bottle Size: The primary home-use size is 25 oz, with additional sizes available at 1.5 oz, 8.5 oz, and 64 oz to suit travel, home, and salon needs.
  • Hair Type: Formulated specifically for medium to fine hair textures, including color-treated and chemically processed hair.
  • Sulfate-Free: Contains no sulfates, reducing the risk of color stripping, scalp irritation, and excessive dryness associated with conventional detergent-based shampoos.
  • Salt-Free: Free of sodium chloride, a key requirement for maintaining the longevity of keratin smoothing treatments and preventing color loss.
  • Paraben-Free: No parabens are included in the formulation, aligning with cleaner beauty standards and reducing potential scalp sensitivity.
  • Vegan Formula: All ingredients are plant-derived or synthetically produced, with no animal-derived components used at any stage of formulation.
  • Cruelty-Free: The product has not been tested on animals at any stage of its development or production.
  • Gluten-Free: Contains no gluten-based ingredients, making it a compatible choice for individuals with gluten sensitivities or related scalp concerns.
  • Squalene-Free: Does not contain shark squalene, reflecting an ethical sourcing position on marine-derived cosmetic ingredients.
  • Scent: Fragranced with Fleurs de Temps, a signature floral scent developed exclusively for the Number 4 brand portfolio.
  • Dispenser Type: Equipped with a pre-measured pump dispenser that controls the volume of product released per press to minimize waste.
  • Formula Type: Concentrated liquid formula that generates a rich lather from a smaller volume of product compared to standard non-concentrated shampoos.
  • Key Technology: Utilizes cationic charge technology to create an electrical interaction with the hair shaft, enhancing lift, movement, and lasting volume.
  • Dimensions: The 25 oz bottle measures 7.87 x 4.13 x 2.48 inches, sized to stand upright on a standard shower shelf without tipping.
  • Net Weight: The filled bottle weighs 1.98 pounds, consistent with the density of its concentrated liquid formulation.
  • Brand Origin: Manufactured by Number 4 High Performance Hair Care, a premium salon brand with roots in Texas.

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FAQ

It is legitimately formulated with color-treated hair in mind. The formula skips sulfates and sodium chloride — two common ingredients that accelerate color fade — so it is far gentler on dyed hair than most conventional shampoos. If you are investing in regular salon color, this salon-grade cleanser is designed to protect that investment between appointments rather than work against it.

Probably not in a meaningful way. This volumizing shampoo is built for medium to fine hair textures, and the lightweight formula reflects that. On thicker or coarser hair, it may feel like it is barely touching the surface — you might find it leaves hair under-cleansed, flat, or simply underwhelming compared to a formula designed for your texture.

The pre-measured pump is there to guide you, and it is worth trusting. One to two pumps is typically enough for short to medium hair lengths, with an extra pump for longer hair. The formula is concentrated, so piling on more product will not boost volume — it will just make rinsing harder and shorten the bottle's life.

Yes — daily use is one of the design intentions behind this formula. Because it contains no sulfates or aggressive detergents, it cleanses without stripping the scalp's natural oils in the way harsher shampoos tend to. For fine-haired users who wash daily to manage flatness or oiliness, it holds up well as a regular part of the routine.

It is one of the better options for post-keratin care precisely because it contains no sodium chloride, which is the main ingredient that degrades keratin bonds and shortens treatment results. It also skips sulfates, which is another standard requirement after most keratin services. That said, always confirm the specific waiting period and product requirements with your stylist before switching up your routine.

The Fleurs de Temps fragrance is noticeable — it is a refined floral scent, not something light or barely there. It does linger softly after rinsing, which most users find pleasant. If you are fragrance-sensitive or prefer unscented hair care, it is worth knowing this before you buy, as the scent is a real presence rather than a background note.

For a single person with short to medium hair using the pump as directed, expect roughly two to three months before the bottle runs out. Longer hair, more frequent use, or sharing the bottle with a partner will shorten that estimate. The pump does genuinely help pace your usage, so do not bypass it by free-pouring directly from the spout.

A small number of reviewers have flagged pump quality concerns — occasional inconsistency in the dose or the mechanism feeling less sturdy than expected. However, this appears to be an isolated issue rather than a widespread flaw across the product line. The majority of users report the pump functions reliably throughout the life of the bottle.

The Number 4 Volume Collection Volumizing Shampoo 25oz delivers what most fine-hair users describe as a genuine, noticeable difference at the roots — not a dramatic transformation, but real lift that holds into the afternoon rather than collapsing by mid-morning. The effect is most pronounced when you pair it with lightweight styling products and avoid heavy conditioners that can weigh strands back down.

The lather is richer, the rinse feels cleaner, and the volume effect is more consistent than what you typically get from budget-tier sulfate-free options. Whether that difference justifies the price gap comes down to your priorities. For fine-haired, color-treated users who wash frequently, the concentrated formula stretches further than it first appears, which softens the per-wash cost over time.