An insulated outer garment utilizes the plumage of geese as its primary insulating material. This type of jacket relies on the loft, or fluffiness, of the down feathers to trap air and thus minimize heat loss from the wearer’s body. For example, a coat filled with this material is often chosen for its superior warmth-to-weight ratio in cold weather conditions.
The appeal of this type of outerwear lies in its exceptional thermal efficiency and compressibility. Its lightweight nature allows for easy packing and portability, making it suitable for activities such as hiking, camping, and travel. Historically, explorers and mountaineers favored garments using this natural insulator due to its reliable performance in extreme environments.