- Synthetic SpiraFil high loft insulation and blanket construction prevent cold spots and work together to keep you comfortable all night
- Blend of 3-denier, conjugated spiral hollow fibers and 1-denier polyester fibers provides loft, warmth and compressibility
- Polyester taffeta shell is protected with a Durable Water Repellent finish that causes moisture to bead up and roll off
- Brushed lining in chest and footbox for added warmth and comfort
- Full-length zipper; zipper guard runs the entire length of the draft tube to prevent fabric from getting caught in zipper
- No more midnight drawcord fumbling—smooth, flat upper cord and hard, round lower cord make top opening adjustments easy
- Marmot NavoWave +45°F Sleeping Bag includes a compression stuff sack
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.
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