How Does Down Keep You Warm at Night and Where Do Down Feathers Come From?

Down is the soft, fluffy layer of feathers that is below regular bird plumage and helps insulate birds’ bodies from cold.

Down, whether on a duck or goose or in a sleeping bag, has tiny notches that hook together and trap layers of air.

Trapped air is a good insulator of heat and helps keep you warm and cozy at night.

The discovery of feathers trapped in ancient amber suggests that some species of dinosaur may have possessed down-like feathers.

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