How Puffer Jackets Are Designed to Trap Heat Without Excess Weight
Braving sub-zero temperatures once meant layering on multiple heavy wool coats, thick waxed canvas dusters, and bulky furs that weighed down the body and made walking exhausting. For decades, cold-weather survival was directly linked to the physical heft of a garment, forcing outdoor workers, explorers, and commuters to choose between staying warm or staying mobile. […]
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