I'm a certified sleep science coach who has tested over 50 mattresses. Down, the soft, insulating feathers found beneath the outer plumage of ducks and geese, is prized for its exceptional warmth, ...

Geese and ducks use down the same way we do: to insulate. The biggest difference is that they grow theirs, and we take ours—from the clusters of soft, fine feathers under their bellies. But how do ...

Have you run across the term “down fill power” while shopping for sleeping bags, puffer jackets, or a duvet? These numbers range from 450 to 900, and sometimes above. Generally—but not always—the ...

Down is, of course, the most classic pillow fill, known for its plush, “luxury hotel” feel. While sleeping on a down pillow sounds wonderful — what could be better than resting your head on an airy ...