Puffer and Insulated Jackets: Fabric, Baffles and Fill Performance
An insulated jacket is a system of shell, baffle and fill, and each element must suit the others or the insulation migrates.
The practical guidance below is written for buyers and product developers who need a specification that a mill can meet.
Shell fabric requirements
Downproof calendered or high-density woven fabric at 20 to 40 GSM prevents fibre migration.
Well-handled, this becomes a selling point that customers can actually perceive rather than a technical footnote.
Baffle and stitch construction
Stitch-through baffles are lighter, while box-wall baffles loft better and hold warmth in cold conditions.
Include the requirement in the purchase order, because that is the document both parties rely on commercially.
- Ask for a separate price line for the requirement
- Confirm minimum quantities before committing the colourway
- Build one extra approval round into the calendar
Fill options
Natural down, recycled down and synthetic fills differ in warmth per gram, packability and wet performance.
Review machine maintenance schedules, because worn parts change results gradually and are easily missed.
Seams and finishing
Seam sealing, bonded baffles and DWR finishing work together to keep wind and light rain out.
Ask the laboratory to state the sample condition, including whether the specimen was wet, stretched or conditioned.
- Confirm the numeric range and the test method in the specification
- Keep an approved physical standard at the machine
- Retest after the agreed care regime before shipping
Testing checklist
Downproof testing, fill power, thermal resistance, air permeability and water repellency after washing.
Expect the cost and lead time implications to appear in sampling and capacity booking rather than in the yarn price alone.
Summary
A clear specification, a trained operator and a documented test together remove most of the risk from this part of the programme.
