A sleeping bag is a portable, insulated covering designed to keep a person warm while sleeping outdoors or during camping trips. Typically made from synthetic materials or down feathers, sleeping bags come in various shapes and sizes, including rectangular and mummy styles. They often feature zippers, hoods, and draft collars to enhance warmth and comfort. Sleeping bags are rated for different temperature ranges, making it essential to choose one suitable for the conditions. They are commonly used in conjunction with other camping gear, such as tents and sleeping pads, to provide a comfortable sleeping environment in nature.