The CozyFoot? footbox on this bag uses a fleece lining to stay 25% warmer than standard lining material, so you can finally go to sleep without keeping your socks on. Instead of the typical straight opening, this bag also has a contoured top to support your head and pillow. Even when it's 30 °F outside, 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 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. You can keep small things, such as gloves or a flashlight, in the interior tuck pocket.