Helium 600 Long Cosmos
Helium 600 Long Cosmos

Helium 600 Long Cosmos

RRP £300.00 Now £225.00
Product Details

Perfect for backpacking, bike touring or trekking, the Helium 600 navy sleeping bag is a lightweight and compact sleeping bag for all-round performance. With 582g of 90-10 pure duck down with 700 fill power, this sleeping bag keeps you warm all night long thanks to the slanted box-wall baffle design throughout. The HELIUM™ 20D outer shell is a compressible yet tough fabric to withstand the rugged countryside, the inner lining is Supersoft™ 30 that feels great against your skin whilst increasing breathability to keep you cool on those warmer nights. This sleeping bag has an alpine fit that sits close to your body and traps in heat and the Lode Lock™ closure ensures your sleeping doesn’t come undone during the night. This sleeping bag also comes with a waterproof roll-top stuff-sack and storage cube for easy transport.


Good Night's Sleep Temperature: -10°C/14°F
Comfort: -1°C/30°F
Comfort Limit: -8°C/18°F
Extreme: -26°C/-15°F
Total Weight: 1070g / 38oz
Fill Weight: 582g / 21oz
Pack Size: 26cm x 23cm x 20cm
  • HELIUM™ 20D outer shell is very light and highly breathable
  • 582g of 90-10 Pure Duck Down with a minimum fill power of 700
  • Alpine fit maximises thermal efficiency
  • Slanted Box-Wall baffles throughout
  • Optimised down distribution and fill weights using a baffle-by-baffle approach
  • Mid-level side seams
  • 5 baffle anatomically shaped hood
  • 4 baffle anatomically shaped and offset foot-box
  • Full length Gemini zip baffle and integrated collar with Lode Lock™ closure
  • Supplied with waterproof roll-top stuff-sack and storage cube
Delivery & Returns

UK Standard Delivery

  • UK Standard Delivery is Free for orders over £30
  • UK Standard Delivery is £1.99 for orders under £30

UK Next Day Delivery

  • The cost of Next Day Delivery is £4.99
  • If you order by 2pm, you will receive your order the next working day
  • If you order anytime at the weekend, you will receive your goods on the following Tuesday.
  • Next Day Delivery is not available to the following: Ireland and the Scottish Highlands

UK Returns

  • Free UK returns within 30 days of purchase

Stock Alert

Please alert me via email when this product is back in stock.

Size Guide



Chest 36” 38” 40” 43” 46” 49” 52”
Waist 28” 30” 32” 34” 36” 38” 40”

Chest sizing varies widely depending on the garment, brand or range. Instead we have outlined below a few of the main types of fit found in our ranges and how they compare.


Waist 28” 30” 32” 34” 36” 38”
Leg Length Short Regular Long
  30” 32” 34”