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Normally, only the fluffy down near the base of the feather is used for bedding. The fibers in down are hollow and tend to be puffy, rather than well ordered like the rest of the feather. Because the down is hollow and fluffy, it traps a boundary layer of air near your body. Heat from your body heats the trapped air in among the down fibers. Since the trapped air does not move around much, it acts as an insulating barrier between you and the cold air in the room.

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15y ago

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