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Helium, long

by Marmot
Helium, long
SKU: marmot-23230-2958-LZ

Remarkably light and compact, the Helium 15° Sleeping Bag - Long delivers impressive insulation during three-season backpacking and mountaineering treks.

$ 269.00
$431.00 Save 38%
+ Free ground shipping!


Featuring Pertex® Microlight on the exterior, its lofty 800-fill-power-down insulation and water-resistant Down Defender treatment will keep you warm and dry. After an epic day on the mountain, give your feet a rest in the roomy wrap-around footbox. Smooth, curved baffles help keep the fill in place, while the nautilus multi-baffle hood with a drawcord, snagless insulated draft tube, and full-length two-way zipper with a zip-guard slider limit heat loss. If the interior gets too warm, use the fold-down secondary zipper to get some air. Tuck small items into the internal stash pocket.


  • Fold-Down Second Zipper Provides added Ventilation, Easy Access. Anti-Snag Slider reduces Snagging
  • Anatomically Designed Footbox with Wrap-Around Construction increases Warmth
  • Smooth-Curved Baffles Reduce Down Shifting. Nautilus Multi-Baffle Hood limits heat loss
  • Filled and Finished in Rohnert Park, California
  • Certified 800+ Fill Power Goose Down
  • Ultralight Pertex Microlight 20d 100% Nylon Ripstop DWR 1.03 oz/sqyd
  • EN Tested
  • Full Length Locking YKK Two Way Zipper with Zip-Guard Slider
  • Down Defender to Improve Water-Resistance in Wet Conditions
  • Internal Stash Pocket
  • Snagless Insulated Draft Tube
  • Two Way Zipper Sliders
  • Hood Draw Cord
  • Zipper Garage
  • Stretch Tricot Baffles
  • Two Hang Loops
  • Stuff and Storage Sack Included

Detail Photo(s)

Tech Specs

Main Materials : Pertex 20d 100% Nylon R/S 1.03oz/yd
Lining Materials : 30d 100% Nylon DWR 1.09 oz/yd
Insulation Materials : 800+ Fill Power Goose Down
Weight: 2lbs 4.5oz (1040g)
Fill Weight: 22oz (625g)
Bag Loft: 6
Bag Temperature F: 15° F
Bag Temperature C: -9° C
EN Rating:
  • Comfort: 25.2°F / -3.8°C
  • Lower Limit: 13.5°F / -10.3°C
  • Extreme: -20.6°F / -29.2°C
Interior Length: 87in (221cm)
Bag Dimensions (Shoulder x Hip x Foot): 63in (160cm) x 58in (147.3cm) x 41in (104.1cm)
Bag Zipper position: LZ