Down insulation uses all-natural goose or duck down to achieve warmth, while synthetic insulation relies on man-made materials like polyester. Natural down is extremely lightweight, compressible, warm, and is known for having a long lifespan. However, its performance tends to decrease when it gets wet. “The lofty nature of down allows air to be trapped between its filaments, which is then heated by your body heat,” Hopkins explains.
Synthetic down, on the other hand, refers to man-made down that’s designed to replicate the quality and warmth of real down with materials that can handle getting wet a little better. It’s typically made from polyester fibers that mimic down’s air-trapping abilities to hold in heat. Synthetic down isn’t quite as light or compressible as natural down, but it excels in wet-weather climates, maintaining its fill power when wet. “It actually stays breathable and continues to insulate when soaked, while also drying out more quickly than down,” Hopkins says.
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