Insulated with high-loft 725-fill-power duck down, the Mountain Equipment Helium 400 Sleeping Bag provides 3-season comfort for climbers and backpackers.
Fill
725-fill duck down
Temperature Rating (F)
28 degrees (F)
- Premium 725-fill-power duck down is warm, lightweight and compressible
- Downproof and wind-resistant, the densely woven synthetic shell is light, compressible and tough; silky soft lining is also downproof and highly breathable
- Durable Water Repellent finish on shell causes water to bead up and roll off
- Ground-level side seams allow top layer to fully wrap around body and keeps draft tube in place, further helping prevent cold air from seeping through the zipper
- Slant box wall baffle construction uses slanted walls for stability and thermal efficiency; construction keeps down from migrating, eliminating cold spots
- 4-baffle trapezoid footbox is wide in toe area and narrow at the heels for comfort that does not compromise warmth
- Protecting the head and neck, the hood features 5 baffles and an anatomic fit to provide warmth and low weight
- Alpine Fit features a semi-tapered mummy profile with a tapered lower leg section to maximize warmth and minimize weight without restrictiveness
- Single antisnag draft tube (along the 3/4 length zipper) and semi-floating neck collar drapes comfortably, blocking the escape of heat and sealing out drafts
- Mountain Equipment Helium 400 down sleeping bag comes with a lightweight stuff sack and mesh 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 Mountain Equipment 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 | 28 degrees (F) - EN |
| Tested Comfort | 39 degrees (F) - EN |
| Temperature Rating (F) | 28 degrees (F) |
| Temperature Rating (C) | -2 degrees (C) |
| Shell | Synthetic |
| Insulation Type | Down |
| Fill | 725-fill duck down |
| Lining | Unavailable |
| Sleeping Bag Shape | Mummy |
| Hip Girth (in.) | Unavailable |
| Stuff Sack Size | 7 x 11 inches |
| Stuff Sack Volume | 7 liters |
| Compressed Volume | Unavailable |
| Gender | Unisex |