- 650-fill-power Nikwax Hydrophobic Down™ absorbs 90% less water and dries 3 times faster without using dangerous PFCs
- Responsible Down Standard certified; certification ensures that the waterfowl in the down supply chain are treated humanely
- The fit of the bag has been perfected in the Therm-a-Rest onsite cold chamber to create the With Additional Room for Multiple positions (W.A.R.M.) fit
- W.A.R.M. fit allows room for multiple sleep positions without compromising thermal efficiency
- SynergyLink™ Connectors—removable ultralight straps—create a secure bag-to-sleeping-pad connection that optimizes the comfort and thermal efficiency of your sleep system
- SynergyLink Connectors function best with regular-width sleeping pads (not included) that are 3 in. thick or less when inflated
- Zoned insulation maximizes warmth and saves weight by intentionally placing down where you need it most
- Box baffled construction uses mesh walls to maximize loft and minimize cold spots
- Toe-asis™ foot warmer pocket is a baffled pocket of insulation that rapidly warms cold feet
- Quilt and blanket loops let you customize your sleep system by layering Therm-a-Rest quilts or tech blankets (not included) for increased warmth
- Heat-trapping draft collar; full-length zipper draft tube; snag-free zipper; cinchable hood; external zippered pocket
- Compression sack and storage sack included
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Therm-a-Rest Backpacking Sleeping Bags