Some brands will label their jackets with a ‘down fill equivalent’ to approximate the level of warmth to the more conventional system. Because there are so many different materials used as down alternatives, each one has different insulating properties which don't often translate directly to a down fill power rating. While friendlier options are welcomed, it also makes the rating system more confusing. Down alternatives, like recycled polyester and natural kapok, have become increasingly popular among more earth-conscious and animal-welfare conscious consumers.
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