What material is typically used in the stuffing of high-quality sleeping bags?

The use of down feathers in the stuffing of high-quality sleeping bags is well-regarded due to their exceptional insulating properties. Down is the soft layer of feathers found under the tougher outer feathers of ducks and geese. It has the unique ability to trap air, which provides warmth without adding excessive weight or bulk. This makes down-insulated sleeping bags highly effective for retaining body heat, especially in cold conditions.

Additionally, down is compressible, allowing it to pack down small for easy transport while still providing excellent insulation when lofted. Quality sleeping bags often feature down that has been ethically sourced and treated to resist moisture, enhancing their performance in various weather conditions.

While polyester, wool, and cotton can all be used in sleeping bags, they do not provide the same level of warmth-to-weight ratio and compressibility that high-quality down offers. Thus, down feathers are typically favored for premium sleeping bags targeted at those seeking optimal warmth and minimal weight.