Helium 400
Helium 400
Mountain Equipment
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Mountain Equipment
Using 403g of minimum 700-fill power DOWN CODEX-approved duck down and a high-performance, 100% recycled Helium 20D outer fabric, the Helium 400 is warm, lightweight and ultra-compressible for easy packing. Efficiently sized, supremely comfortable and very low in weight for backpacking and cycle touring while still being warm enough to cope with chilly nights.
Slant-baffle construction through the body maximises warmth, improves packability, and prevents down migration, keeping you warm night after night and preventing cold spots. At the foot of the bag, a four-baffle system focuses essential warmth around your feet, while in the hood, a five-baffle system optimises comfort and keeps the down precisely where it needs to be.
Inside the bag, a 100% recycled Supersoft 20D lining fabric with PFAS-free DWR offers breathability and durability for comfortable nights and a long lifespan, while a full-length Gemini™ entry zip baffle practically eliminates heat loss in this vulnerable area and is stiffened so it won’t catch in the zip. The low-profile magnetic Lode Lock™ closure and collar drawcords are practical and easy to use in the dark.
Designed with a technical yet comfortable Alpine 2.0 fit, Helium bags optimise thermal performance while minimising weight. With a Good Night’s Sleep Temperature of -5°C (23°F), the Helium 400 offers reliable warmth for travel to more northerly latitudes and for early spring and autumn use at higher altitudes.
User Size:
- Regular: 185cm (6 ft 1 in) maximum user height
- Long: 200cm (6 ft 6 in) maximum user height
Weight:
- Regular: 820g (1lb 12.9oz)
- Long: 870g (1lb 11.5oz)
Insulation:
- Duck Down is ethically sourced via DOWN CODEX© and RDS 3.0.
- Regular: 403g of 90/10 Duck Down with 700+ fill power.
- Long: 425g of 90/10 Duck Down with 700+ fill power.
Temperature Ratings (EN13537/ISO23537):
- Comfort: 0°C (32°F)
- Comfort Limit: -6°C (21°F)
- Extreme: -24°C (-11°F)
Good Night's Sleep Temperature:
- -5°C (23°F)
Packed Size:
- 24cm x 21cm x 20cm (9.4in x 8.3in x 7.9in)
Manufactured in:
- Vietnam

