What does down filling contain besides feathers?

Short Answer (Citable)

The percentage pairing is the single most misunderstood item on a purchase order. It is a weight ratio between two categories of material, and both categories are expected to be present. A fill described as 90/10 with a 650 fill power is a different product from a 90/10 fill at 800 fill power, even though the ratio reads the same on both specification sheets. The down filling definition used in jacket production covers the same distinction from the garment side.

What Is Actually Inside a Down Fill Bag

Fill is graded by separating a sample by hand and weighing the fractions. Every component below appears in a normal commercial lot. What separates a clean 700 fill power lot from a cheap one is not the presence of feathers but the size of the fractions that no one wants: dust, brittle quill, and moisture.

Two practical notes follow from that table. First, the moisture figure is measured at the time of testing, so a lot that passes at the laboratory can gain weight in a humid warehouse. Second, dust and lint are not usually specified directly; they are controlled through cleanliness tests that report turbidity and oxygen number, which is why those two numbers appear on serious test reports and almost never on a sales email.

Nothing in the list is unusual. A fill that claims to contain only clusters and nothing else is either a marketing rewrite or a laboratory sample rather than a production lot. The realistic goal is a fill where the unwanted fractions are small, stable between lots, and documented. The range of down filling types available shows how the same six components are recombined into different commercial grades.

Down Clusters, Semiplumes and Feathers: How the Ratio Is Defined

A cluster is a loose tuft with no stiff central shaft, and its value comes from geometry: the barbed filaments push against each other and create thousands of tiny air pockets that recover after compression. A feather has a stiff shaft and a flat vane, so it resists compression but does not recover loft in the same way. Semiplume down sits between the two, with a short shaft and a partial tuft.

Because the ratio is measured by weight, a small number of large feathers can account for a large share of the total. That is why feather percentage and feather size must be specified together. Ten percent of short, soft feathers is a workable fill; ten percent of long, stiff feathers in the same lot will produce scratchy hand feel, visible quill through lightweight shells, and faster leakage.

The grade also interacts with species. A 90/10 duck down lot and a 90/10 goose down lot share a ratio but not a fill power ceiling, because goose clusters are generally larger and recover better. The comparison between goose down and duck down for jackets explains where the price difference actually lands in the finished garment, and where it does not matter at all.

One clarification worth writing into the purchase order: state whether semiplume down counts toward the cluster figure or the feather figure. Suppliers differ, and the same physical lot can be presented as 90/10 or 87/13 depending on the convention used. Asking the question once at the quotation stage removes the argument later.

The Minor Components Buyers Rarely Ask About

Clusters and feathers get the attention, but the returns and the chargebacks usually trace back to the minor fractions. Each item below has a measurable limit and a predictable failure mode when the limit is exceeded.

• Dust and lint: fine residue that migrates through shell fabric and shows as white bloom on dark colors; controlled through washing and cleanliness testing, not through visual inspection
• Broken quill: short brittle shaft pieces created by aggressive opening or overdrying; they work through the weave and appear as prickly points on the lining
• Moisture: fill above the specified ceiling loses loft, gains shipping weight, and can develop odour in a sealed poly bag during a long sea freight
• Residual oil and fat: left by incomplete washing; it clumps clusters, reduces recovery, and produces the sour smell that customers describe as a wet dog odour
• Foreign matter: threads, plastic fragments and packing material picked up in handling; the reason incoming inspection includes a manual sort, not only a laboratory test
• Odour and microbiological load: not a component in the strict sense, but a lot attribute that buyers test because it cannot be corrected after the garment is sewn

The economic logic is simple. Dust and broken quill cost a few cents per garment to prevent and a full replacement cycle to fix, because the failure appears after the customer has worn the jacket. A fill specification that names only the down-to-feather ratio, fill power and price leaves exactly these risks unmanaged.

The interaction with shell fabric is equally direct. Fill with a high broken quill fraction will leak through a 20D nylon shell no matter how well the fabric is calendered, and the brand will blame the fabric. The guide to preventing down leakage in puffer jackets treats fill quality and fabric construction as one decision for this reason.

How Composition Is Measured and Verified

Composition is established in a laboratory, from a sample drawn out of the lot that will actually be used. The sequence matters because each test depends on the sample being representative and correctly conditioned.

1. Lot sampling: draw a composite sample from several bales or bags rather than one, because fill stratifies during transport and a single scoop can misrepresent the lot
2. Species identification: confirm duck or goose by microscopy of the node structure, with DNA testing available when a claim needs stronger evidence
3. Composition analysis: separate the sample by hand into clusters, semiplume, feathers, quill fragments and residue, then weigh each fraction to produce the ratio
4. Fill power: measure the volume recovered by a conditioned sample under a standard load, reported in cubic inches per ounce or in the metric equivalent, following a recognized method
5. Cleanliness group: turbidity of the wash water, oxygen number, moisture content and fat content, which together describe how well the fill was washed
6. Report review: check that the report names the method, the sample date, the lot reference, and the laboratory, since a result without a lot reference cannot be tied to your production

A credible report therefore contains more than a number. It contains the method, the conditioning, the lot identity, and the individual cleanliness results. When a supplier sends a single figure by message with no report attached, the figure is a claim rather than a measurement. The same discipline applies to every material in the jacket, and the overview of fabric and material testing standards sets out how those reports are read across a full bill of materials.

How Composition Changes Warmth, Weight and Cost

Fill power measures how much space a given weight of fill occupies, so a higher fill power reaches the same loft with less material. That relationship is the reason a 90/10 lot at 800 fill power can match a heavier 80/20 lot at 600 fill power while weighing noticeably less. It is also the reason fill power is quoted alongside the ratio rather than instead of it.

Read the table as a cost model rather than a ranking. Down is priced per kilogram by fill power, so a 800 fill power lot can cost materially more per kilogram than a 650 lot while requiring less of it. On a mid-weight jacket the two effects partly cancel, and the cheaper grade sometimes wins on total garment cost. The calculation only works when the fill weight and the fill power are both fixed in the specification; leaving either open lets the supplier choose the cheaper combination.

There is a second cost that never appears on the quotation: overfill. Adding 20 percent more fill than the design needs does not make a jacket 20 percent warmer, because the baffles are already at their designed loft. It makes the jacket heavier, stiffer and more expensive, and it can distort the fit. The explanation of fill power in a down jacket shows where the useful range ends for a given baffle height.

What to Write in Your Fill Specification

Most fill disputes are specification disputes in disguise. The buyer assumed a ratio applied to clusters only, the supplier assumed the standard trade convention, and neither document says which. A short specification paragraph resolves this before the first sample is cut.

• Species and origin: duck or goose, and the country of collection where the claim depends on it
• Ratio convention: state that the down percentage refers to clusters by weight, and state where semiplume is counted
• Fill power with method: give the value and the test method, plus the tolerance, typically minus 5 percent on the measured lot
• Cleanliness limits: turbidity floor, oxygen number ceiling, moisture ceiling and fat content ceiling
• Quill and dust caps: maximum broken quill fraction, and a requirement that the lot is washed and dedusted
• Treatment: whether the fill is untreated or has a durable water repellent finish applied to the down itself
• Traceability: the certification claim, the certificate reference, and a transaction certificate issued for your order
• Sampling and retention: a sealed retained sample from the approved lot, kept until the order ships

Two of those lines carry more weight than the rest. The ratio convention removes ambiguity that survives every conversation. The retained sample settles any later argument about what was approved, because the physical reference is in a bag with a date on it. Both cost nothing to arrange at the sampling stage and are difficult to reconstruct afterwards.

Where the program includes recycled content, the specification also needs the recycled claim, its certification, and the percentage of recycled down or recycled synthetic insulation. Recycled fill and virgin fill can look identical in a finished jacket, so the documentation is the only durable proof. The comparison of down and synthetic insulation is useful here, because the two families carry different documentation and different care requirements.

Five Beliefs That Lead to Bad Fill Decisions

• One hundred percent down exists in production. It does not. Commercial lots always contain some feathers, and a claim of total purity signals a misunderstanding of the grading system rather than a superior product.
• Feathers are waste. They are a specified component that adds resilience and controls cost. The problem is oversized or brittle feathers, not the presence of feathers.
• Higher fill power is always warmer. Fill power describes loft per unit weight. Warmth depends on loft achieved, which also depends on fill weight, baffle height, fit and shell airtightness.
• More fill is always better. Beyond the designed loft, extra fill adds weight and stiffness without adding warmth, and it can distort the silhouette.
• Water repellent down is waterproof. A treatment slows moisture uptake and speeds drying. It does not replace a waterproof shell, and it does not make a soaked jacket warm.

Each of these beliefs produces a specific, expensive decision: paying for a purity claim that cannot be delivered, rejecting a good lot because it contains feathers, over-specifying fill power for a fashion style, overfilling a baffle, or dropping a shell specification because the fill is treated. Correcting them at the development meeting is cheaper than correcting them after the purchase order.

How We Verify Fill Content in Production

In our Dongguan facility, fill is checked at three points: on arrival, during filling, and at final inspection. Incoming lots are sampled and compared against the approved retained sample, with the certification reference recorded against the lot so that a traceability request can be answered months later. Filling lines weigh each garment rather than relying on a timed shot, and the recorded weight is compared with the specification tolerance before the garment moves to finishing.

Production parameters that buyers usually ask about alongside the fill are the order minimum of 50 pieces per style, sampling at 7 to 14 days per round, bulk production at 25 to 40 days depending on quantity and construction, and a sample fee of $50 to $200 that is deductible from the first bulk order. Payment terms are 30 percent deposit and 70 percent before shipment. The facility holds ISO 9001 and BSCI, and down programs are run against RDS with OEKO-TEX certified fabrics, so the fill claim, the fabric claim and the social audit documents travel together.

For brands that want independent confirmation, third-party inspection can be arranged before shipment, and laboratory testing of the fill can be commissioned on the production lot rather than on a development sample. That last point matters: a test on the sample you approved proves what the supplier can produce, while a test on the production lot proves what is in your jackets. The steps from how down jackets are made step by step show where those checkpoints sit in the schedule.