A down jacket is a warm jacket

A down jacket is a warm jacket that is filled with the soft feathers of a duck or goose, and the outer layer is usually made of materials like nylon or polyester. Down, the soft feathers mentioned, are usually taken from the ******* and wings of the duck or goose. Down is the material which provides the insulation that makes down jackets so warm, as they retain heat inside the jacket. Generally, the more fluffy the down is inside the jacket, the more air gets trapped inside the jacket, and the higher the ability of the jacket to keep out the cold. However, today, most down jackets are not made of pure down, and are often mixed with other materials, such as feathers.