Challenger Comfort Fiber 0 is comfortable and features an extra long side zip that runs all the way to the foot end, allowing you to open the bag fully and use it as a blanket. The arm opening for your left hand doubles as extra ventilation. The main zip has three sliders, so you can create an arm opening for your right hand, too. It's moved higher up from the ground for easier access and to prevent cold spots. An inside drawcord for the hood opening can be reached from inside the bag. This sleeping bag provides maximum comfort.