An outer garment insulated with the soft, fluffy under feathers from ducks or geese is a type of coat known for its exceptional warmth-to-weight ratio. This type of outerwear traps air, creating a thermal barrier that effectively retains body heat in cold conditions. For example, individuals in frigid climates often rely on this apparel for protection against extreme temperatures.
The significance of feather-filled coats lies in their superior insulating capabilities and packability, making them a preferred choice for outdoor activities such as hiking, camping, and mountaineering. Historically, these garments have been essential for explorers and adventurers venturing into cold regions, providing crucial protection against hypothermia. Their lightweight nature allows for ease of movement and reduced burden during strenuous physical activity.