Filled with 380g 600+ Fill Power selected premium duck down, the sleeping bag keeps you stay in warm and dry. Pure natural and healthy material, fluffy and soft, no odor or impurities. Comfort temperature: 37°F-55°F, Lowest temperature: 26°F. Double zipper and windproof strip design prevent cold air from entering. Mummy sleeping bag head shape fits the head better and keeps warm, the lower body is rectangular, you can move foots freely.