Defend against chilliness with a sleeping bag that delivers impressive warmth. The Cosmic down 0°F is a 600-fill hydrophobic DriDown™ insulation that offers water resistance and loft that old man winter just can’t match. There’s also a durable down proof polyester ripstop shell and polyester taffeta liner, and thermal comfort hood to keep you extra cozy when the mercury drops. Why worry about shivering when you have better things to do? Like sleep.