Sea to Summit Circuit 15F Down Sleeping Bag
Sea to Summit Circuit 15F Down Sleeping Bag
Description
Light and packable, this Sea to Summit sleeping bag is filled with Ultra-Dry down to keep you warm and comfy. Plus, its adaptable design seals tight when it's cold or opens to a quilt on warm nights.
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.
Features
- Adaptable, lightweight and packable
- Lightweight breathability: Premium 20-denier fabric offers perfect next-to-skin comfort night after night after night
- Ultra-Dry down, soft-touch fabric and recycled materials keep you warm and comfy
- Hybrid box-baffle construction prevents down migration, eliminating cold spots for even warmth and consistent insulation
- Opens flat for airflow on warm nights or zips closed to lock in warmth when temperatures drop for comfort in all conditions
- Quality 650+-fill-power Ultra-Dry duck down and lightweight fabrics allow the bag to pack down small into the supplied compression sack
- Soft liner and wider, thermally-efficient shape enhance warmth and comfort—no matter which position you sleep in—and give you room to move
- Wraparound zipper lets you fully open the footbox for maximum venting or fine-tune airflow to regulate temperature
Specifications
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 15 degrees (F) - ISO |
| Tested Comfort | 23 degrees (F) - ISO |
| Temperature Rating (F) | 15 degrees (F) |
| Temperature Rating (C) | -9 degrees (C) |
| Weight | 2 lbs. 6.1 oz., 2 lbs. 8.92 oz., 2 lbs. 13.5 oz. |
| Shell | 100% recycled polyester |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 650+-fill-power Ultra-Dry duck down |
| Fill Weight | 1 lb. 7.4 oz., 1 lb. 9.2 oz., 1 lb. 12.7 oz. |
| Sleeping Capacity | 1-person |
| Lining | 100% recycled polyester |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | 67 inches, 73 inches, 78 inches |
| Shoulder Girth (in.) | 57 inches, 61 inches |
| Hip Girth (in.) | 55 inches, 59 inches |
| Stuff Sack Volume | 20 liters |
| Compressed Volume | 9 liters, 9.7 liters, 10.8 liters |
| Gender | Unisex |
| Sustainability | Contains recycled materials, Down certified to the Responsible Down Standard (RDS) |
Shipping & returns
Free standard shipping to the 48 contiguous states, with no order minimum. Alaska, Hawaii and U.S. territories may carry an additional charge.
You have 30 days to return your order, counted from the day it arrives. See our Shipping policy and Return and refund policy for the details.