Warmth, weight, and price on a down jacket come from four choices made early: the insulation type, how much fill goes into each chamber, the shell fabric, and the chamber construction. Settling those points before sampling gives brands comparable quotes and samples that match the line plan.
This guide walks through what to define for down and synthetic insulated outerwear ahead of production in Vietnam. It is written for brands preparing an insulated program for an upcoming season, and it follows the sequence a factory uses when reviewing a tech pack for an insulated style.
For waterproof membranes and seam-sealed shells, see our guide to outerwear manufacturing in Vietnam. For the silhouettes and proportions buyers are developing now, see the coat trends taking shape for winter 2027.
Down or synthetic: the first decision
Insulation choice drives the rest of the program. It determines shell requirements, construction method, labeling rules, and a large share of the unit cost.
Down
Highest warmth for its weight, with strong compression for packable styles. Down calls for a downproof shell and lining, chambered construction, a fill description tied to a named test method, and labeling that meets each destination market's rules.
Synthetic insulation
Holds warmth when damp and is described by weight per square meter. Sheet insulations cut and sew with the other layers, which simplifies construction and supports consistent supply on reorders.
Many programs use both. A body-mapped jacket may put down in the torso and synthetic insulation in the hood, cuffs, and underarm panels. Each insulation type then needs its own line in the tech pack, with its own weight and placement noted.
Working with down
Fill power, stated with its test method
Fill power measures loft: the volume a fixed weight of down occupies, stated in cubic inches per ounce. Higher fill power traps more air per gram, so the same warmth can be reached with less down by weight and a smaller packed size.
The number alone leaves room for confusion. Testing standards differ in cylinder size, sample weight, and conditioning. The IDFB method conditions the sample with steam; the Chinese GB/T method uses dry heat. The same lot of down can return different results under each method. A fill power on a tech pack should name the method behind the result, and the supplier's test report should use that same method.
Down-to-feather ratio and labeling by market
Down is sold by its ratio of down cluster to feather, often written as 90/10 or 80/20. That ratio governs how a garment may be labeled, and the thresholds differ by market. In the United States, the prevailing industry standard calls for at least 75 percent down to label a product as down. The European standard, EN 12934, sets the threshold at 60 percent and requires the actual down content on the label.
A brand selling into several markets should choose fill that meets the strictest label it plans to use. Label content, care instructions, and fiber disclosures for US shipments are covered in our guide to packaging and labeling compliance.
Fill weight per chamber, graded by size
A single total fill weight for the jacket is rarely enough for accurate quoting or sampling. The factory needs a chamber map that shows every baffle or quilted channel, with the fill weight in grams for each chamber and each size. Fill weights should grade with the pattern so a size XL carries more down in its back panel than a size S.
Chamber-level fill weights are a common gap in insulated tech packs. They affect both warmth consistency and cost. Our guide to production-ready tech packs covers the full set of details a factory needs before it can quote.
A fill power, a ratio, and a gram weight for every chamber in every size give a factory a clear basis for quoting and production.
Construction: how the chambers are built
Chamber construction governs how evenly the insulation lofts and how much labor goes into each garment. The two main methods suit different products.
Sewn-through construction
Quilting lines stitch the shell directly to the lining and form the chambers. The method is lighter, faster to sew, and uses fewer components, which makes it the usual choice for mid-weight jackets, liners, vests, and layering pieces. Designers manage loft along each stitch line through channel width and placement.
Box baffle construction
Internal fabric walls separate the shell from the lining so each chamber holds its full loft across the panel. Box baffles add panels, cutting, and sewing time to every garment, and the unit cost reflects that work. They suit heavyweight and cold-weather styles where warmth is the primary goal.
Methods can mix on a single jacket. A parka might use box baffles in the body and sewn-through channels in the sleeves to control bulk at the arm. The chamber map should show which method applies to each panel.
A shell built to hold its fill
Down needs a tightly woven shell and lining that keep the clusters inside the garment. Downproof fabrics are densely constructed and are often calendered or coated to close the weave further. When selecting a shell, ask the mill to confirm the fabric is downproof and suitable for the fill you plan to use.
Sewing details matter as much as the fabric. Needle size and stitch density on the quilting lines affect how well the shell holds its fill, so both belong in the tech pack. The same applies to the lining, pocket bags, and any panel that touches the insulation.
Shell choice also sets the look of the garment, from matte nylons to brushed and wool-blend faces. For the fabric directions taking shape for the coming season, see our guide to autumn 2027 textures, fabrics, and silhouettes.
Responsible down and certification
The Responsible Down Standard (RDS) is a voluntary standard covering the welfare of the ducks and geese that supply down, including a ban on live plucking and force-feeding. It tracks the material from farm through processing and garment production, with chain of custody verified at each stage.
For a finished garment to carry an RDS claim, all of the down in the product must be certified, and use of the RDS label must be approved by the certification body. RDS certification is held at the facility level within our production network and can be verified on request. If your program will carry an RDS claim, note it at the inquiry stage so certified fill and supporting documentation are built into sourcing from the start. Our factory audits and compliance guide explains how buyers verify certifications of this kind.
Sampling, costing, and quality checks
Insulated styles follow the same two-stage sample development process used for other outerwear. The quality sample confirms construction, chamber layout, and fit. The production sample, made in the final shell and fill, becomes the reference for bulk, including the approved fill weights.
Fill is a major cost line in a down jacket. A change in fill power, ratio, or grams per chamber moves the unit price, as does the choice between sewn-through and box baffle construction. Our line-by-line reading of what it costs to make a jacket shows where those lines sit in a factory cost breakdown.
During production, inspection for insulated garments adds checks beyond seams and measurements: fill weight against the approved details, even distribution across chambers, and label content matched to the fill test report. Our guide to apparel quality control and inspection covers how inline and final inspections are structured.
Timing for autumn 2027 insulated programs
Insulated outerwear for autumn and winter 2027 is in development now. Fill and shell fabrics need to be confirmed and ordered early enough to clear the Lunar New Year closures in Vietnam and China. Outerwear capacity for the season is booked well in advance. Our guides to seasonal production planning and planning production around Tet lay out the booking windows.
Autumn 2027 Production Calendar
Our production calendar works backward from an autumn 2027 retail date, with the fabric, sampling, and booking milestones for each stage. Download the Autumn 2027 Production Calendar.
What to send with an insulated outerwear inquiry
Tech pack and chamber map
Graded specs, construction method by panel, and fill weight in grams for every chamber in every size.
Fill details
Down or synthetic, fill power with its test method, down-to-feather ratio, or synthetic weight per square meter.
Shell and lining
Fabric direction for shell, lining, and trims, including finish and downproof requirements.
Quantities
Target units per style and per colorway, and whether the style is a one-time order or a repeat program.
Markets and claims
Destination markets for labeling, and any certification claims such as RDS planned for the hangtag.
Delivery window
The in-store or in-warehouse date the program needs to meet, so fill and fabric can be booked against it.
Insulated outerwear programs
Planning down or insulated outerwear for autumn 2027?
Pham Fashion House manages insulated outerwear production in Vietnam for brands with finalized tech packs and production volumes starting at 3,000 units per style. Send your details and target delivery date, and we will review fit, capacity, and timing with you.
Start a production inquiry