Sierra Designs
Utopia 15 Degree Sleeping Bag
A great year-round bag or a three-season choice for cold sleepers, this bag combines HeatSync continuous-filament insulation with Flex technology to deliver tough to beat quality in a light, durable design.
FEATURES:
- Heatsync Insulation
- Ergonomically shaped footbox
- Snag-free zipper tracks
- Draw cord at collar
- Draft collar
- Flex stretch external construction
- Offset Layer Construction
- Ergonomic hood
- Pillow pocket
- Zipper draft tube
- Pad locks
- EN Tested
- Includes stuff and storage sacks
- Chest pocket for valuables
Ergonomically Shaped Foot Box
Shaped to keep you sleeping in comfort. Allows for ease of movement, while remaining thermally efficient.
Flex Technology Construction
Flex eliminates constriction, allowing the sleeping bag to move with the user and keeping them warm and comfortable. Flex greatly improves a bag`s thermal efficiency. Technically advanced elastic binding tape is used on the 3-season down Flex bags while we use a lighter proprietary elastic thread in the Ultralight Series. Ultralight bags feature 7 inches, 3 Season bags feature 8 inches of expandable baffles that allow the girth of the bag to expand as and where needed.
HeatSync
Short staple insulation that is warm, lightweight and compressible.