Completely redesigned for 2026! We’ve taken what made the Thermodown 0 great and added significant improvements: RDS-certified 800 fill-power duck down 20D ripstop nylon shell and lining with PFC-Free DWR treatment Split baffle pattern prevents cold spots from migrating down Sleeping pad straps to keep you on your pad Phone pocket for handy access to your electronics 15 percent lighter and more packable! Stay warm and comfortable, no matter the season, in our outstanding Thermodown 0 down sleeping bag. With excellent materials and performance, your search for a great four-season sleeping bag ends here! Superior Insulation Cold weather is no match for the 28.6 ounces of 800-fill power RDS-certified down insulation stuffed into every corner of this bag. You will stay toasty warm down to 0F (-17C). However, the added warmth does not compromise on size and weight. The bag packs down to just 10 x 7 inches and comes in at only 2 pounds 9 ounces. Benefits We've done our best to make this a great bag. On warm nights, easily shed heat with the large two-way YKK zipper which opens from top and bottom. To prevent annoying snags, we've incorporated a wide zipper guard. To keep the