This sleeping bag is designed to fit the human body shape and provides both warmth and mobility for tossing and turning. The hood is closed to prevent cold air from entering and preserving warm air inside. The inside of the zipper is a 3 inch tube that is fully filled with padding to block cold air from the zipper for added warmth. Comfortable design allows you to toss and turn freely while retaining mummy warmth. Compression belt compression case for easy compact storage. Fully machine washable.