Down and synthetic-fill jackets, gilets and long-line puffers with baffle or quilted construction, where fill power and distribution have to be tested.
Every padded jacket claims warmth. The ones that deliver it have a stated fill power, a stated fill weight per panel and a construction that keeps the fill where it was put - and all three are testable.
We specify fill by weight and power, require RDS certification where down is used, and check distribution and migration after the garment has been made and washed, because fill that drifts into the hem turns a good jacket into a cold one.

Hydrostatic head and spray-rating testing on bulk fabric and on finished, seam-sealed garments.
Down and wadding weights verified per panel, with fill power tested and certification confirmed.
Elastane performance tested after repeated wash cycles, not only on first-sample fabric.
Seam sealing, bonding and welding checked for adhesion and durability after wash and wear testing.
Send a reference garment or a tech pack and we will come back with the factory, the fabric route and a costing.