How to Choose Sleeping Bags for Backpacking
Sea to Summit Ascent 15F Sleeping Bag
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Stay warm in unpredictable backcountry conditions with the Sea to Summit Ascent 15F sleeping bag. It's equipped with high-loft down, roomy heat-retaining construction and excellent ventilation.
Shop similar productsKey Details
Fill
750+ fill-power goose down
Temperature Rating (F)
15 degrees (F)
- In colder temperatures you can cinch down the technical hood, zip up the draft-tube protected zippers and allow the 750+ Ultra-Dry goose down to keep you warm
- In warmer conditions, the Free-Flow Zip System lets you unzip in different configurations for superior ventilation and even turn the bag into a quilt
- You can even close the snaps at the shoulders, open the footbox zipper and wear the Ascent at camp
- Thermally efficient, relaxed mummy fit with room in the hood to fit an Aeros pillow (not included)
- Option to zip-couple with a compatible Sea to Summit women's sleeping bag for space for two
- Lightweight, 20-denier recycled nylon shell with a non-PFAS durable water repellent (DWR) finish to protect against wind and moisture
- 20-denier recycled nylon liner for greater comfort
- RDS-certified, 750+ fill-power goose down with a non-PFAS Ultra-Dry Down treatment to stay drier in damp conditions
- Box baffle construction throughout with vertical baffles in the torso to minimize down shift and maximize warmth retention
- Free Flow Zip System offers excellent temperature regulation and multiple sleeping bag configurations
- 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 | 28 degrees (F) - ISO |
| Temperature Rating (F) | 15 degrees (F) |
| Temperature Rating (C) | -9 degrees (C) |
| Shell | 100% RCS recycled nylon |
| Zipper Location | Left/Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 750+ fill-power goose down |
| Sleeping Capacity | 1-person |
| Lining | 100% RCS recycled nylon |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Volume | 13 liters |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) Contains recycled materials |
