The semi-circular hood with adjustable drawstring keeps your head warm even in extreme conditions, and the sleeping bag is filled with hollow cotton, which has a good fluffiness and warmth The fabric is breathable, which ensures that the sleeping bag is breathable and comfortable.Separate zip at the bottom also allows your feet to breathe often. The semi-circular hood with adjustable drawstring keeps your head warm even in extreme conditions. These sleeping bags pack down into an ultra compact bag in seconds. No folding or rolling required. Simply tuck it into the sturdy carry bag, pull the straps and it folds up into a two-pound pouch that fits easily into any backpack!