The full-cover construction locks in the heat by eliminating quilting cold spots, making it perfect for extreme weather sleeping. You'll stay comfy with lightweight Coletherm® hollow polyester insulation and the Thermolock? draft tube helping to keep your body heat in the bag. The soft flannel lining and pillow gives you extra warmth and comfort from head to toe, while the Comfort Cuff? design makes sure you only have soft fabric around your face while you sleep. Thanks to the ZipPlow? zipper, you'll get snag-free opening and closing every time. A durable, cotton canvas cover will ensure you get to use this extra-warm bag season after season. Stash a few small things, such as gloves or a flashlight, in the exterior tuck pocket.