- Zipper closure
- Rated 15 and deg;F, the Helium is a 3+ season sleeping bag.
- The Helium has a fold-down second zipper providing added ventilation, and easy access.
- The anti-snag slider reduces snagging.
- Marmot anatomically designed the footbox with wrap-wround construction to keep your feet warm, and decrease heat loss.
- The smooth-curved baffles reduces down shifting for a nice and even heat retention.
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