In the real world, other factors come in to play, like level of physical activity and whether you run hot or cold. That can be helpful in some ways, but you should know that these ratings are based on lab-controlled environments. Mens Puffer Jackets Hooded Puffer Jacket, BLACK Faux Fur-Lined Hooded Puffer Jacket, BLACK Hoodie Puffer Jacket, WHITE Puffer Vest, BLACK Faux Fur-Lined. (You can think of this like comparing wattages between LED bulbs and incandescent bulbs.) Sometimes you'll get a temperature rating that will tell you how cold the jacket is rated for. 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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