Marmot Helium Down Sleeping Bag

-12°C Comfort Limit (EN13537:2012), 560g of 800 Fill Power Down (US Method)
Weighs 966g (Regular bag)
Code: SS21255V
  • From £374.99
  • (FREE UK & EU Delivery)
  • RRP £419.99
+ In Stock Now   |   Usually dispatched within 24 hours

The balance of weight, pack size and temperature rating make this a great choice for 3-4 season backpacking. It features 800+ fill power hydrophobic down, a full length zipper, lots of loft and an extremely effective hood design.

Marmot says:

Remarkably light and compact, the Helium delivers impressive insulation. Use it as a three-plus season bag to substantially reduce your load while backpacking and mountaineering.

Marmot's Helium Down Sleeping Bag has been updated, now using 100% recycled material for the shell. It still offers a great balance of quality, weight, packability, and performance. It's comparable to many more expensive products, as it is lighter and more compressible than many of its competitors. It uses 800+ fill power down protected with Marmot's Down Defender to help the down to stay dry longer, loft better when damp and dry more quickly than untreated down. The new recycled Pertex Quantum fabric offers a combination of lightweight and good durability plus it's DWR coating will offer some water resistance. The fabric feels really soft which allows the down to loft freely and the slightly brushed feel of the Microlight lining fabric is extremely comfortable against your skin.

The -12°C Comfort Limit gives you some flexibility for pushing it into four seasons when paired with a good insulated mat. All the usual features are present with a bag of this quality plus the additional small 'fold-down' second zip which allows you to roll the top of the bag down. This is perfect for a warmer night to avoid overheating or for a cold evening where you want to be sitting in the bag inside the tent.

- Reviewed by BasecampGear

Help and advice:
  • Filled and Finished in Rohnert Park, California 
  • Certified 800+ Fill Power Goose Down 
  • "Fold-Down" Second Zipper Provides added Ventilation and Easy Access 
  • Anatomically Designed Footbox with Wrap-Around Construction increases Warmth 
  • Full Length Locking YKK Two Way Zipper with Zip-Guard Slider 
  • Smooth-Curved Baffle Construction Reduces Down Shifting 
  • Nautilus Multi-Baffle Hood 
  • Down Defender to Improve Water-Resistance in Wet Conditions 
  • EN Tested 
  • Internal Stash Pocket 
  • Snagless Insulated Draft Tube 
  • Hood Draw Cord 
  • Two Way Zipper Sliders
  • Zipper Garage 
  • Stretch Tricot Baffles 
  • Two Hang Loops 
  • Stuff and Storage Sack Included


  • Regular bag weighs: 978g (excludes storage bags)
  • Regular length fits: 183cm
  • Fill weight: 560g
  • Zip: Left hand zip
  • Interior length: 206cm
  • Shoulder width: 155cm
  • Hip width: 142cm
  • Foot width: 113cm
  • Stuff sack dimensions: 17.8 x 35.6cm



  • Long bag weighs: 1066g (excludes storage bags)
  • Long length fits: 198cm
  • Fill weight: 620g
  • Zip: Left hand zip
  • Interior length: 222cm
  • Shoulder width: 160cm
  • Hip width: 147cm
  • Foot width: 117cm
  • Stuff sack dimensions: 17.8 x 35.6cm


Temperature Ratings

  • EN Rating Comfort limit: 23°F / -5°C
  • EN Rating Lower comfort limit: 11°F / -12°C
  • EN Rating Extreme limit: -25°F / -31°C


  • Insulation: 800+ Fill Power Goose Down with Down Defender, RDS down
  • Shell Top: Pertex Quantum© 100% Recycle Nylon Plain Weave
  • Shell Bottom: Pertex Quantum© 100% Recycle Nylon Plain Weave
  • Lining: 20d 100% Recycled Nylon
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