The Hydrogen delivers enough warmth for ultra-light cool-weather climbs and backcountry excursions, while still weighing in at a wispy one pound for light and fast climbs and hikes.

Features
• Classic trapezoidal foot box for more foot room
• Full-length zipper
• Hood draw cord positioned for easy access
• Insulated draft tube eliminates cold leaks through the zipper
• Stretch Tricot Baffles provide ultimate strength, durability and bag life
• Stuff and storage sack included
• Velcro®-free face muff keeps the drawcord and zipper away from your face
• Zipper guards help repel biting zipper coils
• Filled and finished in Santa Rosa, California
• Certified 850+ fill goose down the best weight to warmth down in the market; independently tested and certified by International Down and Feather Laboratory in Salt Lake City, Utah. Retested at fill time in Santa Rosa to ensure 850+ fill power every time. If the down does not meet our in-house test, we send it back
• EN tested
• Full baffle construction
• Nautilus 6-Baffle Hood: 6 chambers of down around head for better down control and fit, hood cord is positioned for easy access