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 heat in, a large draft collar automatically wraps around your neck. No need to deal with cumbersome drawstrings or scratchy velcro. The fully insulated and contoured hood can also be completely cinched down.
• A roomy trapezoidal foot box with extra insulation will keep your toes nice and warm.

Accessories

Two elastic sleeping pad straps with adjustable buckles are included. The bag also comes with a durable compression sack allowing you to easily fit it into your pack. Between adventures, use the included mesh storage bag or hanging loops to properly store the bag.