100ml Period Underwear — IY008 4-Layer Ultra-Absorbent Leakproof Brief with Extended Gusset

Who Actually Buys a 100ml Period Underwear SKU — and Why a Range Without One Loses Them

The market for ultra-absorbent period underwear is not the general period underwear consumer — it is a narrower, higher-need segment that a standard 20–50ml range simply does not serve, and that gap shows up directly in a retailer's return rate and customer churn rather than in any obvious merchandising signal. Four buyer profiles converge on the 100ml capacity point. The first is the heavy-flow medical user — consumers with diagnosed conditions such as menorrhagia, fibroids, or adenomyosis who bleed at volumes that render standard pad and tampon change schedules, and lighter period underwear, functionally useless within a few hours. The second is the postpartum user, managing lochia bleeding in the weeks after delivery, a use case where volume and duration both exceed anything a moderate-absorbency product was designed for. The third is the perimenopausal user, whose flow can become unpredictably heavy and prolonged as hormone cycles shift, often after years of being a light-to-moderate buyer. The fourth is the overnight and long-duration user — anyone sleeping eight or more hours, traveling, or working a shift where a mid-shift change isn't possible, plus the specific case of heavy-flow days where a menstrual cup is being used as the primary method and the period underwear is the backup layer against overflow rather than the primary product. Every one of these buyers researches "period underwear for heavy flow" or "period underwear that won't leak overnight" and, if a brand's range stops at 50ml, that buyer converts on a competitor's listing instead. A retailer without a 100ml SKU is not offering that customer a smaller version of the same solution — they are offering no solution at all, which is a harder churn to recover from than a simple down-sell.

Why the Extended Gusset — Not Just a Bigger Pad — Is What Makes 100ml Achievable

A common assumption among buyers new to sourcing heavy-flow period underwear is that reaching a higher absorbency number is simply a matter of adding more absorbent material to the same gusset footprint used in a 20–50ml product. That assumption is the reason many "heavy flow" period underwear products on the market still leak: a standard gusset shape concentrates fluid at a single contact point, and past a certain volume, that point saturates locally before the rest of the absorbent core has taken on any load at all — the product fails at its weakest point while the majority of its stated capacity sits unused. IY008's gusset is engineered differently: widened and lengthened from front to back, it changes the geometry of where and how fluid is distributed, spreading flow across a longer, broader surface area instead of funneling it into one saturation-prone zone. This is a structural design decision, not a marketing embellishment — the extended footprint is what allows the full absorbent core beneath it to actually be used at volume, rather than being defeated by point-saturation long before the core's total capacity is reached. For a buyer evaluating competing "100ml" claims, this is the question worth asking every supplier: is the stated capacity backed by a gusset geometry engineered to distribute that volume, or is it a bigger absorbent pad dropped into the same footprint used for a 20ml product? IY008's front-to-back extension is the specific structural answer for why it reaches 100ml without the localized failure that undermines standard-gusset competitors at the same capacity claim.

Why Buyers Choose This Style

• Owns the absorbency ceiling of the entire catalog — at 100ml, IY008 is the highest-capacity SKU Ljvogues produces, positioning it as the flagship a brand anchors its heavy-flow range around, not one option among several similar styles.

• Extended gusset geometry, not just more padding — widened and lengthened front-to-back, the gusset is engineered to distribute fluid across a broader surface and prevent the localized saturation that causes leaks in standard-footprint heavy-flow products at the same absorbency claim.

• Serves buyer segments a moderate-absorbency range cannot — heavy-flow medical conditions, postpartum recovery, perimenopausal flooding, and overnight 8+ hour use are use cases a brand loses entirely without a genuine 100ml option in its lineup.

• S–3XL sizing signals inclusivity across body types — a six-size range with custom sizing support means the heavy-flow buyer is not also forced into a limited size band, a common failure point in ultra-absorbent SKUs elsewhere in the market.

• 4-layer construction with antibacterial leakproof barrier — breathable, absorbent, leakproof-plus-antibacterial, and outer layers work together so 100ml capacity does not come at the cost of skin comfort, odor control, or a bulky, clinical look.

• 92% cotton / 8% elastane with smooth-seam, second-skin stretch — the outer layer preserves a regular-underwear look and feel despite the extended internal gusset, so the product does not read as a medical device under clothing.

4-Layer Construction

Layer 1 — Breathable (Moisture-Wicking)

At 100ml capacity, the skin-contact layer carries a functional load that a 20ml product's top layer never has to manage: sustained contact with a much larger volume of absorbed fluid held in close proximity to skin for extended wear windows, particularly in the overnight and postpartum use cases this SKU is built for. A standard-absorbency top layer only needs to wick moisture away quickly at low volume; at 100ml, the same layer has to keep pulling fluid down into the core continuously, over hours, without becoming saturated itself or trapping moisture against skin, which is the direct cause of irritation and prolonged dampness in lower-quality heavy-flow products. This layer's moisture-wicking performance across the full width of the extended gusset — not just its center point — is what keeps the skin-facing surface dry even as the layers beneath it are holding significantly more fluid than a standard SKU ever will.

Layer 2 — Absorbent (Large-Capacity Core)

This is the layer that physically defines the 100ml claim, and its large-capacity core is built to work in tandem with the extended gusset shape rather than independently of it. In a standard-footprint product, an absorbent core sized for higher capacity would still be defeated by a narrow, short gusset that funnels fluid into one section before the rest of the core is engaged — capacity on paper that the garment can't actually use under real flow conditions. Because IY008's gusset is widened and lengthened front-to-back, this core has the surface area to accept fluid across its full length rather than at a single point, meaning the 100ml figure reflects capacity the wearer can actually access during heavy flow, overnight use, or postpartum bleeding — not a theoretical maximum reached only under slow, even fluid introduction that doesn't resemble how heavy flow actually behaves.

Layer 3 — Leakproof + Antibacterial

At standard absorbency levels, a leakproof barrier mostly has to prevent occasional overflow at the end of a wear cycle. At 100ml, this layer is under sustained pressure for far longer stretches — an 8+ hour overnight use, a multi-hour postpartum recovery window, or a heavy medical-flow day — which means both its liquid-barrier integrity and its antibacterial function have to perform for a longer duration without failure or odor development. The antibacterial treatment matters more at this capacity specifically because more absorbed fluid held for longer periods creates more opportunity for bacterial growth and odor if the barrier layer isn't actively managing it, not just blocking pass-through. This layer's full-width coverage across the extended gusset is what backs the leakproof claim at the edges and ends of the gusset, not only at its center — the zones where a standard-length gusset would already have run out of barrier material before the fluid does.

Layer 4 — Outer/Main Fabric

The outer layer's job at 100ml capacity is to make an extended, structurally larger gusset disappear visually and physically under regular clothing — because a buyer's heavy-flow customer still wants underwear that looks and feels like underwear, not a visibly bulky protective garment. The 92% cotton and 8% elastane blend, combined with smooth-seam construction and second-skin stretch, is what allows the wider and longer internal gusset structure to sit close to the body without a visible ridge or panty-line, and without the fabric pulling or bunching at the extended seams the way a lower-stretch fabric would under the same internal structure. This is the layer that keeps the 100ml capacity a private, comfortable feature rather than a visible one — which matters commercially, because a heavy-flow customer buying a "maximum protection" product is often also the customer most concerned about it not looking or feeling like a medical product under their clothes.

Suitable Usage Scenarios

Heavy-flow medical conditions — menorrhagia, fibroids, adenomyosis, and other diagnosed conditions involving high-volume, extended bleeding that standard absorbency products cannot manage through a full change interval.

Postpartum recovery — lochia bleeding in the weeks following delivery, where both volume and duration regularly exceed what a moderate-absorbency product is designed to hold.

Perimenopause — unpredictable heavy and prolonged flow as hormone cycles shift, frequently affecting consumers who were light-to-moderate buyers for years prior.

Overnight and long-duration wear — 8+ hours of sleep, travel days, or work shifts where a mid-cycle change is not possible, positioning IY008 as the "sleep-through-the-night" SKU in a brand's range.

Menstrual cup backup on heavy days — worn as a secondary layer against overflow when a cup is the primary method, particularly during the heaviest days of a cycle.

Flagship anchor for a heavy-flow product line — the SKU a brand uses to advertise "maximum protection" or "for heavy flow" across its marketing, giving the rest of the range a top-of-ladder reference point.

Certifications & Compliance

• ISO 9001 — quality management system certification covering the Shantou manufacturing facility

• ISO 14001 — environmental management system certification

• BSCI — audited factory social compliance

• SEDEX — supply chain ethical data exchange membership and audit

• OEKO-TEX — fabric-level testing for harmful substances across all layers

• PFAS-Free verified — confirmed absence of PFAS chemistry across the fabric and barrier construction

Full certification documentation and test reports are available on request for retail buyer onboarding, customs clearance, and marketplace compliance submissions.

OEM & Private Label Customization

• Branding: Custom logo placement, waistband jacquard, or heat-transfer label; private label packaging supported

• Fabric & Color: Custom colorways and fabric options available at the OEM specification stage

• Sizing: S–3XL standard; custom size grading available for brands with specific fit requirements

• Absorbency positioning: IY008 is intended to occupy the top absorbency position in a brand's range; OEM teams can advise on ladder positioning alongside lower-capacity styles

• Prototyping: Sample development available ahead of bulk order commitment

• MOQ: Flexible — structured to support both a brand's first flagship heavy-flow SKU order and repeat bulk production as the SKU proves out in-market

Technical Specifications

Size Chart (flat garment measurements, ±4cm tolerance)

FAQ

Q1: How is the 100ml absorbency claim actually verified — can I get test data before committing to an order?

The 100ml figure refers to the ultra-absorbency tier of the 4-layer construction, driven by the large-capacity core in Layer 2 working with the widened, lengthened gusset geometry that lets the core absorb across its full surface rather than saturating at one point. We recommend requesting a physical sample and, where a buyer's compliance process requires it, independent third-party absorbency testing before committing to bulk production — this is standard practice for any "maximum capacity" claim in the category, and we support buyers running that verification against their own retail or marketplace substantiation requirements.

Q2: Who is the actual end consumer for a 100ml SKU, and how do I talk about that without sounding like a medical brand?

The core end consumers are heavy-flow medical condition sufferers (menorrhagia, fibroids, adenomyosis), postpartum users managing lochia bleeding, perimenopausal users experiencing unpredictable heavy flow, and overnight or long-duration wearers, including menstrual cup users needing heavy-day backup. Positioning language that performs well without reading as clinical tends to frame the product around outcomes — "sleep through the night without worry," "built for your heaviest days" — rather than diagnostic terminology, reserving direct medical-condition language for product descriptions and FAQ content where a research-stage buyer is actively looking for it.

Q3: How should I position this against competitors also claiming "heavy flow" or "overnight" period underwear?

Most competing "heavy flow" claims are not backed by a gusset engineered for the capacity they advertise — they use a standard gusset footprint with a denser absorbent pad, which is exactly the setup that causes localized saturation and leaks at the edges once real heavy-flow volume is introduced. IY008's differentiator is the widened, front-to-back-lengthened gusset that distributes fluid across a broader area, which is a structural claim you can make explicitly in comparison copy — ask any competing supplier whether their "heavy flow" SKU uses an extended gusset geometry or the same footprint as their standard-absorbency product with more padding added.

Q4: Can this style genuinely be marketed for overnight use, or is that overstating it?

Yes — the 8+ hour overnight window is one of the primary use cases this SKU is engineered for, alongside postpartum and heavy medical-flow use. The combination of full-width Layer 3 leakproof-and-antibacterial coverage and the extended gusset's distributed absorption is specifically what supports multi-hour wear without the point-of-failure leaks that occur when a standard-gusset product is pushed past its practical overnight duration. We'd still recommend against a claim like "guaranteed leak-free for 12 hours" without qualifying it by flow volume, since actual duration performance varies by individual flow — safer positioning is "engineered for overnight protection" paired with the 100ml capacity figure.

Q5: What does MOQ and ordering structure look like for a flagship SKU like this versus a standard style?

MOQ on IY008 is flexible, which matters specifically for a flagship heavy-flow SKU: brands often want to launch it at a smaller initial volume to validate demand before committing to the same bulk quantities they'd order for a core, high-turnover style, and our MOQ structure is built to support that lower-risk entry. As the SKU proves out — which is common once a brand starts marketing it as their top-of-range "maximum protection" option — reorder volumes typically scale up, and we can discuss tiered pricing aligned to that growth pattern once initial sell-through data is available.

Contact & Sampling

Ready to add a 100ml flagship SKU to your period underwear range?

• WhatsApp: +86-19928802613

• Email: info@ljvogues.com

• Factory: Shenzhen Ljvogues Sports Fashion Limited — 8,000m² ISO-certified facility, Shantou

• Request a Sample: Contact via WhatsApp or email to start a sample order for IY008

ISO 9001 & 14001 · BSCI · SEDEX · OEKO-TEX · PFAS-Free verified · Flexible MOQ · OEM/private label supported