Simply put, DriDown™ represents the evolution of down insulation. Regular down is treated with a molecular level polymer to create a hydrophobic finish on each individual down plume. This finish allows DriDown™ to stay dry longer, loft better, and dry faster than untreated down, keeping you warmer in any environment.
DriZone™ 2L Waterproof/Breathable Fabric
An exceptional waterproof/breathable fabric (waterproofness 18,000 mm, breathability 28,000 g/m²/24hrs).
Breathable fabric allows moisture to escape while keeping mother nature's moisture out.
Performance characteristics provide the opportunity to sleep outside the tent.
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", 3 Season bags feature 8" of expandable baffles that allow the girth of the bag to expand as and where needed.
Short staple insulation that is warm, lightweight and compressible.
Ultralight & Base Camp Foot Box Venting
Positioned at the top of the foot box, allows for ergonomic foot box shape as well as venting on Ultralight bags with 1/2 length zipper.
Base Camp (Ye He 20 & 40) bags: 12" of venting
Ultralight bags: 9" of venting
Welded Seam Construction
Weatherproof construction for 4-Season sleeping bags.
Creates a stronger, fully waterproof seam.
No need to worry about condensation or dew.
Ideal construction for use in an emergency bivy and/or snow cave.
Women Specific Bags
Men and women sleep better in sleeping bags designed for their body type. Sierra Designs was the first in 1995 to recognize that sleeping bags should be designed differently for women. The average man is 6 feet tall, but the average woman is 5 feet, 4 inches tall. Body proportions and metabolic rates are also different. We size our women's bags smaller so that women are not carrying additional weight and don't have to heat up more air space in a larger bag. Women's sleeping bags are also designed with narrower shoulders, wider hips and increased insulation in the torso and foot box.
Sierra Designs developed the first women-specific sleeping bags in 1995 (Calamity Jane and Annie Oakley).
Our women-specific bags are tailored to fit a woman's body (narrower at the shoulders, wider at the hips and sized for height).
Offer more insulation in the torso and foot box region.