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Mountain Equipment Helium GT 250 Long sleeping bag, anvil grey

329 
RRP 359 
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Delivery method on Monday 05.10.2026
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Delivery method on Monday 05.10.2026
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Extended return option up to 100 days More info
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Choose the right sleeping bag

The range of Mountain Equipment down sleeping bags is truly wide. From ultralight summer sleeping bags to expedition sleeping bags for extreme conditions. Therefore, we have prepared a concise guide to help you orient yourself and choose the right down sleeping bag.

Quality sleep is one of the basic requirements for full regeneration during every outdoor activity. The Mountain Equipment HELIUM GT 250 LONG down sleeping bag is designed primarily for long journeys. Thanks to its generous cut, it is especially comfortable and ideal for those who like to sleep on their side or back. It weighs an incredible 710 g, yet you can sleep comfortably in it at 1 °C. It is filled with very high-quality duck down. 

  • 100% recycled outer material HELIUM TM 20 D is lightweight, highly breathable, and wind-resistant, treated with PFC-free DWR water-repellent treatment.
  • 300 g of 90/10 duck down with a minimum fill power of 700 cuin.
  • GT Fit cut - spacious and comfortable, allows sleeping in various positions.
  • Diagonal baffles – for maximum thermal efficiency with minimum weight.
  • Optimized down distribution and precise volume for each baffle individually.
  • Anatomically shaped 5-baffle hood.
  • Anatomically shaped and tapered 4-baffle footbox.
  • Full-length side baffle along the zip and integrated neck collar with a simple magnetic Lode Lock™ closure.
  • Extended for people 185 cm tall and over.
  • Supplied with a waterproof stuff sack and a mesh storage sack.

HELIUM 20 – 100% recycled, very lightweight, easily packable

Helium 20 material is 100% recycled, exceptionally lightweight, packable, soft, and at the same time very durable. The high weaving density prevents down leakage, is wind-resistant, and prevents heat loss. Thanks to the PFC-free water-repellent DWR treatment, it is also water-resistant. This material is ideal where low weight and packability are the most important factors.

  • Extremely lightweight - 38 g/m 2.
  • Highly breathable.
  • Wind-resistant.

100% recycled inner material SUPERSOFT TM 20 is chosen for its low weight, high breathability, exceptional durability, and pleasant feel. It is also a material that does not leak down.

  • Low weight (37 g/m 2 )
  • High breathability
  • Durability

Quality duck down with 700+ fill power

Very high-quality duck down from China contains at least 90% down, has a minimum fill power of 700 cuin, and complies with the ethical DOWN CODEX ®. The down is gently cleaned with water without chemical treatment. This reduces mites and their living environment, which is appreciated by allergy sufferers. The down retains its important natural oils and loft, is well packable, has high insulation, and low weight.

  • 300 g of down.
  • Minimum fill power 700+ cuin.
  • Down-to-feather ratio 90:10.
  • Complies with DOWN CODEX ®.
  • Long lifespan.

    Color: Anvil Grey
    Sleeping bag length: 207
    Type of insulating material: down
    Type of down: duck
    DWR (Durable Water Repellent): Yes
    Extreme: -12
    Good night sleep: 1
    Comfort: 7
    Comfort limit: 2
    Compression sack: Yes
    Hood adjustability: Yes
    Storage sack: Yes
    Number of baffles in hood: 5
    Number of baffles in footbox: 4
    Down-to-feather ratio: 90/10
    Collar cinch: Yes
    Fit: GT fit
    Baffle type: Diagonal
    Size: LZ
    Outer fabric: Helium 20D
    Inner pocket: No
    Manufacturers: Mountain Equipment
Product details
Sex Unisex
Colour gray
Filling down
Temperature specification three-season
Sleeping bag shape mummy
Sport hiking, alpinism, camping
Sleeping bag weight up to 750 g
product ID 184742
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Honesty, responsibility and deep respect for the mountains, the environment and nature. These are the values of the British brand Mountain Equipment, which has been part of countless expeditions and climbs to the highest peaks in the world since 1961. For more than 60 years, it has been producing top quality equipment for the most daring mountaineering and polar expeditions to the most inhospitable places on the planet. It prides itself on premium materials and is a major development partner of the GORE-TEX membrane manufacturer

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