Comfort lives up to its name in several important and unique ways. It is cut a little wider than other mummy bags, which makes it less constrictive. Knees can be pulled up within the bag and there's a little more room around the torso for unrestricted movement. There's a separate zipper at the foot, which allows for ventilation in the night and makes it possible for the user to walk around camp while wearing the bag! (Let's face it, nobody wants to get out of their sleeping bag on a cold morning).