Number 4 Styling Foam 6.7oz Hair Mousse

Number 4 Styling Foam 6.7oz Hair Mousse — image 1
Number 4 Styling Foam 6.7oz Hair Mousse — image 2
Number 4 Styling Foam 6.7oz Hair Mousse — image 3
Number 4 Styling Foam 6.7oz Hair Mousse — image 4
Number 4 Styling Foam 6.7oz Hair Mousse — image 5
Number 4 Styling Foam 6.7oz Hair Mousse — image 6
Number 4 Styling Foam 6.7oz Hair Mousse — image 7
74%
26%
62%
Hold Strength
71%
Frizz Control
83%
Volume & Root Lift
88%
Texture & Feel
86%
Scent
81%
Color Protection
63%
Humidity Resistance
79%
Application Versatility
91%
Clean Ingredient Profile
54%
Value for Money
67%
Packaging & Dispenser
84%
Residue & Buildup
69%
Hair Type Compatibility
58%
Longevity of Style
More

Overview

The Number 4 Styling Foam 6.7oz Hair Mousse comes from Number 4 High Performance Hair Care, a brand that sits firmly in the upper tier of professional styling. What sets this volumizing foam apart from the drugstore shelf is a dual promise most mousses fail to deliver: real volume without that dreaded crunchy finish, and humidity resistance that doesn't leave hair feeling stiff or coated. The formulation skips sulfates, parabens, sodium chloride, and gluten — a clean lineup that matters if your hair is chemically treated or sensitive. Hold is medium strength, so don't expect iron-grip control here. Think of it as structured, touchable volume. The scent, called Jour d'Automne, is warm and subtle — a small but genuinely pleasant detail.

Features & Benefits

Where this styling mousse earns its premium positioning is in the details of daily use. Root-lifting performance is genuinely noticeable — the foam adds body at the base without the heaviness that bogs down fine or medium strands. It works on both wet and dry hair, and it functions particularly well as a blow-dry primer, helping direct volume where you want it without buildup. The humidity resistance holds reasonably well in moderately damp conditions — don't expect miracles in a Florida summer, but for everyday frizz management it does the job. For color-treated hair, the sulfate- and sodium chloride-free formula is a real plus, as it won't accelerate fade. The texture is lightweight and velvety, never leaving that white flake residue older mousses are notorious for.

Best For

This volumizing foam is genuinely best suited for people with wavy to loosely curly hair — think the 2a to 3b range — who want definition and body without a stiff cast. If your hair is color-treated, the clean formulation is a genuine advantage. It also fits well into a blow-dry routine as a lightweight primer that preps strands for volume without product overload. People dealing with seasonal humidity or frizz-prone hair in warmer months will appreciate the hold, though those with very dense or coarse curls may want something with stronger grip. And if you've been looking to move away from drugstore mousses toward clean beauty alternatives, this is a natural entry point into that category without sacrificing styling performance entirely.

User Feedback

The Number 4 foam carries a 3.8 out of 5 rating, and that number tells an honest story. Buyers who love it tend to have finer wavy or loosely curly hair, and they consistently praise the light, non-sticky feel and how naturally it enhances their wave pattern. The scent gets mentioned a lot too — in a good way. The criticism, though, is real: several reviewers feel the price-to-size ratio is hard to justify, especially when a can this size disappears quickly with regular use. Some note the hold fades before the day ends, particularly in more humid conditions. Coarser or thicker hair types seem consistently underwhelmed by the hold level. It works very well for the right hair type, but it is not a universal fit.

#Foams
#Styling Products
#Hair Care
#Beauty & Personal Care

Pros

  • Adds genuine root lift and volume without leaving hair feeling heavy or coated.
  • Clean formulation — sulfate-free, paraben-free, and sodium chloride-free — is a real plus for color-treated hair.
  • Works on both wet and dry hair, making it flexible enough to fit different styling routines.
  • Vegan and cruelty-free certifications appeal to conscious beauty buyers without compromising performance.
  • The velvety, lightweight texture disperses evenly and does not leave white residue or flaking.
  • Functions well as a blow-dry primer, helping direct volume where it is needed.
  • The Jour d'Automne scent is warm and subtle — frequently called out as a standout detail by fans.
  • Enhances natural wave pattern for 2a–3b hair types without creating a stiff cast.
  • Reasonable frizz control in moderately humid conditions for everyday use.

Cons

  • Hold does not always last a full day, particularly in high-humidity environments.
  • The 6.7 fl oz can size feels small relative to the premium price point.
  • Coarse or high-density hair types consistently report the hold level is too light for their needs.
  • Cost-per-use is high for buyers who apply mousse generously or style daily.
  • Not a true humidity-proof formula — real-world performance in extreme conditions falls short of the marketing language.
  • The fragrance, while pleasant, is noticeable enough to be a dealbreaker for scent-sensitive users.
  • At a 3.8 out of 5 average rating, buyer satisfaction is mixed and the product does not work universally well.
  • Tightly coiled curl types (3c and above) will likely need a stronger-hold product for definition and control.

Ratings

Our editorial team ran the Number 4 Styling Foam 6.7oz Hair Mousse through a rigorous analysis of verified global buyer reviews, actively filtering out incentivized feedback, duplicate accounts, and bot-generated ratings to surface what real users actually experience. The scores below reflect both the genuine strengths this styling mousse delivers and the recurring frustrations that prevent it from earning universal praise. Nothing has been glossed over — the wins and the trade-offs are equally represented.

Hold Strength
62%
38%
For wavy hair types in the 2a to 2c range, the medium hold does exactly what it promises — keeping waves defined and bouncy without locking hair into an immovable shape. Buyers who style for a soft, lived-in look report the hold feels right for everyday wear.
Coarser textures and tighter curl patterns consistently find the hold insufficient to last a full day, especially in warm or humid conditions. Several buyers note their style starts collapsing by mid-afternoon, which is a real problem at this price point.
Frizz Control
71%
29%
In moderate humidity — think a breezy coastal morning or a mild summer day — this volumizing foam keeps flyaways in check better than most drugstore alternatives. Wavy hair users in particular report noticeably smoother results when used as a blow-dry primer.
In genuinely high-humidity environments, the frizz resistance starts to break down, and buyers in tropical or very humid climates report limited reliability. It handles everyday conditions well but is not built for extreme weather, despite the brand's marketing language around humidity resistance.
Volume & Root Lift
83%
Root lift is one of the most consistently praised aspects of this foam across buyer feedback. Fine and medium hair types report visible body at the crown, and the foam distributes well enough through mid-lengths without the weighed-down heaviness that heavier mousses often cause.
The volume effect is most pronounced on fine to medium hair and is less impressive on thick or dense hair where more product is needed — which then starts to undermine the lightweight feel. A few buyers note the volume fades faster than expected without a finishing spray on top.
Texture & Feel
88%
The velvety, lightweight foam texture is a genuine differentiator and one of the most praised qualities by buyers transitioning from drugstore brands. It disperses evenly through the hair without clumping, and dries to a soft, touchable finish that never feels crunchy or stiff.
A small number of buyers with very fine hair report that even a moderate amount of product can start to feel slightly heavy by day two, particularly if they do not fully wash out residue between applications. The texture is excellent but not entirely weightless for everyone.
Scent
86%
The Jour d'Automne signature scent is warm, subtle, and consistently cited in positive reviews as a standout sensory detail. It gives the styling routine a premium feel without being overpowering, and most buyers describe it as fading gracefully once hair is dry.
For fragrance-sensitive users or those who prefer completely unscented products, the scent is present enough during application to be a genuine concern. A handful of buyers mention mild scalp irritation they attribute to the fragrance, though this appears to be uncommon.
Color Protection
81%
19%
Color-treated buyers consistently highlight the sulfate-free and sodium chloride-free formulation as a meaningful reason to choose this mousse over conventional alternatives. Those with highlights or balayage report noticeably less brassiness and color fade over regular use compared to their previous products.
The color protection benefit is essentially a protective absence — the formula avoids ingredients that cause damage rather than actively repairing or enhancing color. Buyers expecting a visible improvement in color vibrancy rather than just preservation may find the results underwhelming.
Humidity Resistance
63%
37%
For buyers in mild to moderate climates, the humidity resistance is functional and reliable enough to maintain a style through a normal workday. Several reviewers in the southeastern United States and coastal regions note it handles spring and early summer conditions reasonably well.
The humidity resistance claim does not hold up well under pressure — buyers in Florida, Houston, or similarly intense summer climates describe visible frizz and style breakdown within a few hours. The formula performs best when conditions are merely damp rather than genuinely humid.
Application Versatility
79%
21%
The ability to use this styling mousse on both wet and dry hair is genuinely useful in day-to-day routines. As a wet-hair application before diffusing or blow-drying it performs consistently, and as a dry-hair refresher for second-day waves it adds back definition without requiring a full restyle.
Dry application tends to produce softer and less defined results than wet application, so buyers who rely on the mousse primarily as a dry refresh may find it only partially satisfying. A few reviewers note it can look slightly dull or flat on dry hair compared to freshly applied wet styling.
Clean Ingredient Profile
91%
The combination of sulfate-free, paraben-free, sodium chloride-free, gluten-free, vegan, cruelty-free, and shark squalene-free certifications is genuinely comprehensive for a styling product and gives conscious beauty buyers real confidence. This is not a tokenistic clean-label claim — the ingredient exclusions are substantive.
The clean formulation, while impressive, does not come with full ingredient transparency in the way some buyers prefer — a detailed INCI list is not prominently surfaced in product listings. Buyers with specific contact sensitivities occasionally report needing to dig to verify individual ingredients.
Value for Money
54%
46%
For buyers whose hair type is a genuine match — fine to medium wavy hair that responds well to medium hold — the performance does justify the premium positioning relative to drugstore alternatives. The clean formulation, professional-grade texture, and scent all contribute to a product that feels worth the investment for the right person.
The 6.7 fl oz can size is the most common source of buyer frustration, and the price-to-volume ratio is genuinely hard to defend for daily users. Multiple reviewers describe the can as disappearing in under a month with regular use, making the ongoing cost a significant deterrent for even satisfied buyers.
Packaging & Dispenser
67%
33%
The dispenser delivers a consistent foam output without sputtering or uneven distribution, which buyers appreciate when trying to apply evenly through damp hair. The can feels sturdy and reasonably well-made for a styling product in this tier.
The can size draws persistent criticism — several buyers note it looks and feels smaller than expected given the price, and a number of reviewers mention the dispenser begins to sputter before the product is fully used up, leading to waste. For a premium-priced item, the can experience feels slightly underwhelming.
Residue & Buildup
84%
One of the strongest functional advantages of the Number 4 foam over budget alternatives is the complete absence of white flaking or visible residue after drying. Buyers with dark hair in particular call this out as a major selling point, since residue is especially visible and problematic for them.
With repeated daily use, some buyers report a gradual buildup that makes hair feel slightly dull or limp after several days without a clarifying wash. The product itself does not build up aggressively, but like most styling products it performs best with regular cleansing.
Hair Type Compatibility
69%
31%
Within its ideal range — wavy to loosely curly hair types — this volumizing foam delivers consistently positive results. Buyers in the 2b to 3a curl range frequently report it as one of the best mousses they have used for enhancing natural wave without interference or heaviness.
The compatibility story breaks down significantly outside that range. Straight hair finds little benefit from the wave-focused formulation, and tight coils above 3b consistently rate the hold as far too light for their needs. The broad claim of suitability for all hair types is an overstatement.
Longevity of Style
58%
42%
In controlled indoor environments — an office, a climate-controlled home — the style holds reasonably well from morning into early evening. Buyers who spend most of their day indoors report being satisfied with how their waves look six to eight hours after styling.
Style longevity drops noticeably with outdoor activity, physical exercise, or exposure to humidity. Several buyers describe their style looking notably less fresh by mid-afternoon if they spend time outside, and a number note needing to carry the product for touch-ups — which burns through the can faster than expected.

Suitable for:

The Number 4 Styling Foam 6.7oz Hair Mousse is a strong match for anyone with wavy to loosely curly hair — roughly the 2a through 3b range — who wants touchable volume and wave definition without a stiff, crunchy finish. It fits naturally into the routine of someone who blow-dries regularly and needs a light primer that adds body at the roots without loading strands down. Color-treated hair in particular benefits here, since the sulfate-free and sodium chloride-free formula won't accelerate fade or strip vibrancy the way harsher products can. If you live somewhere humid or deal with seasonal frizz, the hold is solid enough for everyday management, though it works best in moderate conditions rather than extreme heat and humidity. Conscious beauty shoppers who prioritize vegan, cruelty-free, and clean-label products will also find this styling mousse checks a lot of boxes without sacrificing real styling performance.

Not suitable for:

The Number 4 Styling Foam 6.7oz Hair Mousse is not the right call if you have thick, coarse, or tightly coiled hair and need serious hold to keep a style in place — the medium hold level simply won't deliver what those hair types demand. Anyone who relies on a mousse to lock in a look from morning through a full day of activity, especially in high humidity, may find the staying power underwhelming. The can size is relatively modest for the price, so if you use mousse generously or daily, the cost-per-use math gets uncomfortable fast. Buyers on a tight budget who are accustomed to drugstore mousse pricing will likely experience sticker shock without feeling enough difference to justify the jump. And if you prefer fragrance-free products due to sensitivity, the signature Jour d'Automne scent — while pleasant to most — is present enough that it cannot be ignored.

Specifications

  • Net Volume: Each can contains 6.7 fl oz (approximately 200ml) of styling foam.
  • Hold Level: The formula provides a medium hold, suitable for defined volume and wave enhancement rather than rigid control.
  • Hair Types: Formulated for all hair types, with optimal results on wavy (2a–2c) and curly (3a–3b) hair.
  • Sulfate-Free: Contains no sulfates, making it safe for color-treated and chemically processed hair.
  • Paraben-Free: Free of parabens, aligning with clean-beauty standards for scalp and hair health.
  • Sodium Chloride-Free: Excludes sodium chloride, which can strip hair color and cause dryness in treated hair.
  • Gluten-Free: The formulation contains no gluten-derived ingredients, appropriate for gluten-sensitive individuals.
  • Vegan Status: All ingredients are plant-derived or synthetic; no animal-derived components are used.
  • Cruelty-Free: The product is certified cruelty-free, meaning no animal testing is conducted at any stage of production.
  • Squalene-Free: Free of shark squalene, reflecting the brand's commitment to ethical and sustainable sourcing.
  • Scent Profile: Carries the brand signature scent Jour d'Automne, a warm, autumnal fragrance present throughout use.
  • Application Method: Can be applied to both wet and dry hair, functioning as a pre-style treatment or a finishing refresher.
  • Primary Benefits: Designed primarily for frizz control, volume enhancement, and definition of natural wave and curl patterns.
  • Color Protection: The sulfate- and sodium chloride-free formula actively helps preserve the vibrancy and longevity of dyed hair.
  • Humidity Resistance: Formulated to resist moderate humidity and help maintain the styled shape in everyday damp conditions.
  • Product Brand Line: Part of the Style Collection by Number 4 High Performance Hair Care, positioned as a professional-tier styling product.
  • Blow-Dry Use: Works effectively as a volumizing primer when applied before blow-drying to boost root lift and body.
  • Texture: Dispenses as a lightweight, velvety foam that absorbs evenly without leaving white residue or flaking on hair.

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FAQ

Yes, and it is actually one of the better choices for that use case. The formula skips sulfates and sodium chloride, both of which are known to accelerate color fade and dry out chemically treated strands. Regular use should not compromise your color vibrancy.

A golf-ball to tennis-ball sized amount of foam is a good starting point for medium-length hair. Fine or shorter hair can get away with less, while thick or longer hair may need a bit more. It is worth starting light — you can always add more, but too much foam at once can weigh hair down.

It works on both, which is genuinely useful. On wet hair it acts as a styling foundation before diffusing or blow-drying. On dry hair it can refresh waves or add a bit of volume to second-day hair. Results are typically more defined when applied to wet hair, but dry application is a solid option for touch-ups.

It handles moderate, everyday humidity reasonably well — enough to keep waves intact during a normal summer day or in a humid climate. That said, it is a medium-hold foam, not a cast-forming gel, so in very high humidity or heavy activity you may notice some frizz creeping back by the end of the day. Temper expectations accordingly.

Probably not on its own. This styling mousse is built around a medium hold level, which tends to work best for fine to medium hair textures. Coarse or very dense hair typically needs something stronger to maintain definition throughout the day. You could layer it with a stronger cream or gel, but as a standalone product it may disappoint.

No, and that is one of the things buyers consistently praise about it. The foam dries down to a soft, touchable finish without the crunch or flaking you get from a lot of cheaper mousses. Hair stays moveable, which is part of why it suits natural wave wearers so well.

The Jour d'Automne scent is warm and noticeable when you apply the foam, but it is not overwhelming. Most people find it fades to a light background scent once hair dries. If you are sensitive to fragrance or prefer completely unscented products, it is worth knowing the scent is definitely there rather than being a faint trace.

Yes, it fits well into a diffuse-drying routine. Apply the foam to soaking-wet hair, scrunch to distribute evenly, and then diffuse on a low-heat setting. It helps define waves and curls during the drying process without creating a stiff cast, which makes it a natural fit for that technique.

At 6.7 fl oz, it is not a large can by professional product standards. For someone using it every day or every other day with a generous application, you are likely looking at three to six weeks before running out. If you style less frequently or use a lighter hand, it will stretch further — but cost-per-use is something worth thinking about before committing.

It is a solid entry point. The clean ingredient list — no sulfates, parabens, sodium chloride, gluten, or animal-derived squalene — covers most of what conscious beauty buyers look for. It is also vegan and cruelty-free. The performance is genuine rather than being a compromise you accept in exchange for cleaner ingredients, which is not always true at lower price points in this category.