Wool fill regulates temperature, resists fire naturally and is measured by GSM rather than a fixed tog. Here is how a wholesale buyer grades the wool, specs the fill weight, chooses certifications and writes an order that reads like a spec sheet.
Wool is the fill to reach for when the selling points are temperature regulation, moisture management and natural fire resistance. It actively balances warmth — insulating when it is cold, breathing and wicking when it is warm — absorbs up to around 30% of its own weight in moisture without feeling damp, and is naturally flame-resistant, dust-mite resistant and biodegradable. The trade-offs are real: it is heavier and bulkier than down, usually not freely machine-washable, and mid-to-high in cost. For a wholesale order, wool is specified by fill weight in GSM, not a fixed tog.
Why wool works as a fill
Wool's crimped fiber traps air while its structure moves moisture: a hydrophilic inner cortex pulls water vapor off the skin and a hydrophobic outer cuticle releases it to the air, so a wool duvet buffers humidity instead of holding a single fixed insulation value. That makes it a strong fit for hot sleepers and variable climates. It is also naturally hostile to dust mites, mold and mildew, and it is a renewable, biodegradable protein fiber.
The fire performance is a genuine contract-market advantage. Wool ignites only at around 570–600°C — far higher than cotton or polyester — and has a limiting oxygen index of about 25–26, so in normal air it struggles to sustain a flame. Instead of melting and dripping like polyester, it chars and self-extinguishes, forming an insulating char layer. The property is inherent to the keratin fiber and permanent, not a chemical finish that washes out, which is why hotel and contract buyers under fire regulations value it.
| Wool | Down | Microfiber | |
|---|---|---|---|
| Warmth style | Actively regulating — warms when cool, cools when warm | Insulating — traps a fixed amount of still air | Insulating — traps air, less breathable |
| Moisture handling | Absorbs ~30% of its weight without feeling damp; wicks vapor | Poor once damp; can retain moisture and odor | Low absorbency; can feel clammy |
| Weight / feel | Heavier, denser; drapes close to the body | Lightest and loftiest; very soft | Light; soft but less breathable |
| Washability | Usually spot- or dry-clean; only washable wool takes a cold cycle | Machine-washable with care; must dry fully | Easily machine-washable; low-maintenance |
| Flame resistance | Naturally resistant: chars and self-extinguishes | Flammable; no inherent resistance | Melts and can drip; petroleum-based |
| Allergies | Naturally dust-mite and mold resistant; low-allergen | Can harbor dust mites if unwashed | Hypoallergenic; resists dust mites |
| Biodegradable | Yes — natural, renewable protein fiber | Yes — natural fiber | No — synthetic (petroleum-based) |
| Relative cost | Mid–high (usually below premium down) | Highest (high-fill-power goose) | Lowest |
| Best use | All-season comfort; hot sleepers; fire-conscious hotels | Cold, dry climates; lightweight warmth | Budget lines; easy-care high-turnover volume |
Grading the wool — and pricing it
Wool grade is driven by fineness, measured in microns: merino is the finest and softest (indicatively around 17–24 microns), lambswool is soft first-shearing fleece, and standard crossbred wool (around 28–35 microns) is coarser, more resilient and cheaper for value fill. Alpaca is a warm, light, low-lanolin niche premium option. Treat micron bands as indicative for framing grade against cost rather than as a fixed classing standard, and set the fineness you want in the tech pack.
Fill weight by season — wool uses GSM, not a fixed tog
Wool duvets are sold by fill weight in GSM: roughly 150–300 g/m² for a light or summer duvet, 300–500 for all-season, and 500–800 for winter, with three-in-one systems that snap two layers together. Because wool breathes, it does not carry a fixed tog — any tog figure is an equivalency, not a certified rating (very roughly, 400–500 g/m² behaves like 7–9 tog). Make the GSM the contractual number, with a tolerance of about five to ten percent, and quote tog only as an approximate guide.
Certifications, decoded for a buyer
Four marks answer four different questions, and one is not a substitute for another. Match the certificate to the claim you need to make.
| Certification | What it certifies | Why it matters to a buyer |
|---|---|---|
| Woolmark | Wool fiber content, quality and authenticity — composition, durability, laundry performance and colorfastness | Independent proof the wool is genuine and meets spec; protects against mislabeled or under-spec fill |
| GOTS | Organic fiber content plus processing across the chain ('Organic' ≥95%, 'Made with organic' 70–94%), with chemical and social criteria | Required for a credible organic claim; covers chemistry and ethics from farm to finished product |
| RWS (Responsible Wool Standard) | Animal welfare (mulesing banned), land management and social conditions, with certified chain of custody | Answers animal-welfare and ethical-sourcing due diligence for retailers and brands |
| OEKO-TEX STANDARD 100 | Chemical safety — every component tested against 1,000+ harmful substances | Assures the finished product is safe for skin contact — key for bedding and children's or hotel lines |
Washability is a contract term, not a lifestyle tip
This is where returns come from, so pin it down. Standard carded wool batting should be labeled spot-clean or dry-clean only; only thermally-bonded washable wool survives a cold wool or delicate cycle, and even then with no spin, no agitation and low or no tumble-dry — often a commercial machine, because wet wool is heavy. Wash it wrong and it felts and shrinks. Wool's self-cleaning nature means it rarely needs washing anyway; airing and sunning refresh it. Confirm the correct care claim on the pre-production sample before you print a single label.
How to spec a wool duvet order
From fleece grade to accepted bulk
- 01
1 · Choose wool type/grade and season
Merino or fine wool for premium and soft hand, standard crossbred for value; pick the season target — summer, all-season or winter.
- 02
2 · Set fill weight (GSM) with tolerance
Specify GSM per season tier (for example 250 / 400 / 550 g/m²) with an agreed tolerance of about 5–10%. Remember tog is only an equivalency for wool.
- 03
3 · Choose shell and quilting
A cotton shell with defined thread count in a wool-proof weave, plus channel (baffle) or box/diamond quilting so the batting cannot migrate or clump.
- 04
4 · Require the right certifications and a fill test
Add Woolmark for quality and authenticity and, as needed, RWS for welfare, GOTS for organic and OEKO-TEX STANDARD 100 for chemical safety; require a fiber-content and fill-weight lab test on samples.
- 05
5 · Sample, then bulk with AQL
Approve a physical pre-production sample — weigh the fill, check the quilting, run the care test — lock the spec, then run bulk with AQL inspection against the approved sample.
Wool sells on regulation and fire safety, but it ships on two contract lines competitors leave vague: the fill weight in GSM with a tolerance, and the exact washability claim, both signed off on the sample.
Sourcing wool duvets factory-direct
BeddingTextilePro manufactures wool duvets and wool-filled bedding factory-direct from Nantong, China — merino and standard wool fills specified by GSM, in wool-proof cotton shells with channel or box quilting, at a 100-set MOQ with full OEM/ODM and Woolmark, RWS, GOTS and OEKO-TEX STANDARD 100 support on request. Send your season, fineness and certification needs and our team will spec the fill and quote within one business day.
Frequently asked questions
- How do we specify warmth if wool has no fixed tog rating?
- Specify fill weight in GSM per season, plus a tolerance. Wool breathes, so it has a fluctuating tog equivalency rather than a fixed tog. Use GSM as the contractual number and quote tog only as an approximate guide — for example, around 400–500 g/m² behaves like 7–9 tog.
- Can we sell wool duvets as 'machine washable'?
- Only if the fill is thermally-bonded washable wool, and even then care is limited — a cold wool or delicate cycle, no spin, no agitation, low or no tumble-dry, often a commercial machine. Standard carded batting should be labeled spot-clean or dry-clean. Confirm the correct care claim on the sample before printing labels, or you risk felting complaints and returns.
- Which certification proves the wool is genuine and good quality?
- Woolmark — it independently tests fiber content, durability, laundry performance and colorfastness. For organic claims use GOTS; for animal welfare and ethics use RWS; for chemical safety use OEKO-TEX STANDARD 100. They answer different questions, so do not treat one as a substitute for another.
- Is wool fill actually a fire-safety advantage for hotel and contract orders?
- Yes. Wool is naturally flame-resistant — it ignites only around 570–600°C and has a limiting oxygen index of about 25–26 — so it chars and self-extinguishes instead of melting and dripping, and the property is inherent and permanent. It is a genuine selling point for contract buyers, though you should still confirm compliance with the destination market's specific fire regulations.
- What construction details stop the fill shifting and clumping?
- A wool-proof, tightly woven cotton shell plus channel (baffle) or box/diamond quilting to hold the batting in place. Specify the shell weave and thread count and the quilting pattern in the tech pack, and verify both on the pre-production sample.
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