How to Choose Sleeping Bags for Backpacking
Sea to Summit Spark Pro 15F Sleeping Bag
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Optimized for comfort, versatility and light weight, the Sea to Summit Spark Pro 15F sleeping bag is warmed with high-lofting 950+ fill-power down and wrapped in super breathable 10-denier fabrics.
Shop similar productsKey Details
Fill
950-fill-power goose down
Temperature Rating (F)
15 degrees (F)
- RDS-certified, 950+ fill-power goose down with a non-PFAS Ultra-Dry Down treatment for maximum thermal performance
- Featherweight 10-denier nylon shell with non-PFAS durable water repellent (DWR)
- Highly breathable 10-denier nylon liner for enhanced comfort
- Technical hood, anatomic footbox and an ergonomic mummy shape means the sleeping bag is ultralight—but not ultra-tight
- Free-Flow Zip System ensures maximum ventilation and the flexibility to open the bag flat as a quilt
- Free-Flow Zip System features a YKK #5 side zipper with zipper plow for reliable, snag-free operation and YKK #3 footbox and shoulder zippers for minimal additional weight
- Zip a Spark Pro to a compatible women's Spark (not included) and share the comfort with your companion
- Front draft collar is fitted around the neck and oversize at the shoulders to retain warmth
- Vertical chest baffles; horizontal baffles lower half and base; box wall baffle construction throughout
- Sea to Summit Guarantee is offered for the lifetime of this sleeping 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 Sea to Summit 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 | 15 degrees (F) - ISO |
| Tested Comfort | 27 degrees (F) - ISO |
| Temperature Rating (F) | 15 degrees (F) |
| Temperature Rating (C) | -9 degrees (C) |
| Shell | Nylon |
| Zipper Location | Left/Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 950-fill-power goose down |
| Sleeping Capacity | 1-person |
| Lining | Nylon |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Volume | 13 liters |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) |
