A sleeping bag is used by a hiker to stay warm throughout the night in the wilderness. They are primarily carried by overnight backpackers and come in a variety of sizes, weights, materials, price-points, and with different functionalities.
Insulation
Down is regarded by most as the best insulating material for sleeping bags. This is because it retains a lot of heat but doesn't weigh much, and is able to be compressed easily to fit in a backpack. Down is harvested from geese and other similar animals, sometimes in an ethical manner. There are different
