How to Choose Sleeping Bags for Backpacking
Therm-a-Rest Haven +20 Sleeping Bag
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The Therm-a-Rest Haven 20°F sleeping bag eliminates insulation between you and your sleeping pad while providing full coverage. The result is ultralight comfort.
Shop similar productsKey Details
Fill
700-fill goose down
Temperature Rating (F)
20 degrees (F)
- Haven bag fits on top of any rectangular mattress (sold separately), attaching with the easy-to-use straps (included); this option allows ventilation for warm weather outings
- For cold weather performance, slip a semirectangular or mummy mattress (sold separately) inside Therm-a-Rest Haven to cut drafts, providing increased warmth
- Durable nylon shell features 700-fill-power goose down insulation; box-baffle construction keeps down from shifting around, so cold spots are prevented
- Down insulation delivers an unsurpassed warmth-to-weight ratio; it�s one of the lightest, warmest and most compressible insulations available
- Eliminating zippers and insulation/fabric below, the wrap-around coverage saves weight
- Full hood provides complete coverage to keep heat in, cold out
- Enclosed footbox at the bottom of bag retains heat where it's needed most
- Chest pocket keeps a few small essentials—headlamp, watch, glasses—right at hand and easy to find even in the dark
- Stuff 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 BagsEach 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.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 20 degrees (F) - EN |
| Tested Comfort | 30 degrees (F) - EN |
| Temperature Rating (F) | 20 degrees (F) |
| Temperature Rating (C) | -6 degrees Celsius |
| Shell | Nylon |
| Insulation Type | Down |
| Fill | 700-fill goose down |
| Lining | Nylon |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 6 x 9 inches |
| Gender | Unisex |
