When choosing a down jacket — especially a custom down jacket — don't just look at the fill power; the fabric is equally important. A reliable down jacket manufacturer will always emphasize these four key points:
Down-proof: The fabric density should be at least 300T; no down should come out when you pat it. This is the first thing a professional down jacket manufacturer checks.
Waterproof and moisture-proof: Down loses its effectiveness when wet. Choose fabrics with a DWR waterproof coating or membrane, so you won't have to worry about rain or snow. For a custom down jacket, this feature can be tailored to your climate needs.
Abrasion resistance and weight: Choose a lightweight 20D-30D for everyday wear; choose 40D or higher for outdoor activities. A good down jacket manufacturer will offer both options.
Breathability: Completely stuffy fabrics will trap sweat, making you feel damp and cold. Fabrics with a breathable membrane or ventilation design are better.
In short: A good down jacket — whether off-the-shelf or a custom down jacket — should combine down-proofness, waterproofing, abrasion resistance, and breathability.
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