The Therm-a-Rest Parsec 0F/-18C Sleeping Bag is a down sleeping bag for winter conditions. Packable and warm enough for nights down to 0°F, it's time to expand your adventures past the spring, summer and fall. The baffles are stuffed with 800 fill power Nikwax Hydrophobic down insulation, providing lightweight warmth as well as resistance to moisture. The 20D, 100% recycled nylon shell holds the down in place as well as protects it. As you snuggle in, your feet will find the Toe-asis foot pocket for toasty feet from night 'till morning.