The feathers on geese or ducks are the outer covering of the bird. They have quills, repel water, and make it possible for the animal to fly. Down lies beneath this protective covering – usually on the belly of a bird - and is light and fluffy. It provides the insulation birds need to keep warm.
Just so, what is 700 fill power down?
For example, one ounce of 800 fill-power down will occupy 800 cubic inches when compressed by a standardized weight. If you use two ounces of 800 fill on jacket A, and two ounces of 700 fill on jacket B, jacket A — with the 800 fill down — will be warmer because it has more loft.
Is a down jacket the warmest?
A down jacket is a jacket which has been insulated with the soft and warm under feathers from duck or geese. Goose down is often regarded as the warmest and lightest but duck down jackets, or jackets with a combination, are often cheaper.
What is a down jacket made of?
A down jacket is a jacket which has been insulated with the soft and warm under feathers from duck or geese. Down is a fantastic insulator as the loft (or fluffiness) of down creates thousands of tiny air pockets which trap warm air and retain heat, thus keeping the wearer very warm.