How to Choose Sleeping Bags for Backpacking
Marmot Never Summer 0 Sleeping Bag
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Marmot Never Summer sleeping bag is great for climbs and treks when subfreezing weather is imminent. Water-resistant 650-fill-power down ensures warmth amid the vagaries of shoulder-season weather.
Shop similar productsKey Details
Fill
650-fill-power duck down
Temperature Rating (F)
0 degrees (F)
- Water-repellent, certified 650-fill-power duck down insulation with Down Defender is protected by a durable nylon shell that has a water-repellent finish to shed condensation
- Down is certified to the Responsible Down Standard (RDS) by Control Union
- Anatomic wraparound footbox increases insulation and room for your feet to enhance warmth and comfort
- Nautilus multi-baffle hood envelops your head in warmth; down-filled collar with easy-access drawcord also adds warmth
- Draft tube backing the full-length, snag-free YKK 2-way zipper prevents cold air from seeping through
- Fold-down second zipper provides added ventilation and easy access
- Internal stash pocket; heater pocket in footbox lets you add a heat packet for cozy warmth; heater packets sold separately
- Includes stuff sack and large storage bag
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 Marmot 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 | -4.7 degrees (F) - EN |
| Tested Comfort | 9.5 degrees (F) - EN |
| Temperature Rating (F) | 0 degrees (F) |
| Temperature Rating (C) | -17 degrees (C) |
| Shell | 20-denier mini ripstop nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 650-fill-power duck down |
| Lining | 20-denier nylon plain weave |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 9 x 18 inches |
| Stuff Sack Volume | 16.8 liters |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) |
