New To Sigma Sports?
£10 off £100* - code SIGNUP10
£25 off £250* - code SIGNUP25

Thermarest Hyperion 20 UL Large Sleeping Bag


Select a colour and size to view stock availability

Hyperion 20 UL Large Sleeping Bag
Email Me When Back in Stock

We're sorry, but unfortunately, we're unable to ship this item to your country

Product ID: 1372925

Thermarest Hyperion 20 UL Large Sleeping Bag

Offering a huge amount of warmth, Thermarest’s Hyperion 20 UL Large Sleeping Bag is filled with 900 fill Nikwax hydrophobic goose down. This down has been treated to stay dry and thus loft more effectively than standard down, providing greater warmth for its weight. All the down used is Responsible Down Standard Certified, ensuring that the birds used in production have been treated humanely.

As well as using premium down, the bag has a box wall construction to keep the down from migrating and to prevent cold spots from forming. The fill has also been zoned to provide more insulation where it is needed most, with 70% of the down on top of the bag and 30% underneath. Down is not only lighter for its weight than synthetic insulation, but it is also much more compressible, so takes up less space in a rucksack or pannier. Both a compression stuff sack and a larger storage sack are provided. SynergyLink connectors allow a sleeping bag and Thermarest sleeping pad to be connected so that they both remain together during the night.


  • 900 fill Nikwax Hydrophobic Down™: Stays drier and maintains loft 60 times longer than untreated down
  • Unrivalled packability: Lightweight materials and precise design allow for a smaller packed size than ever before
  • Box baffled construction: Uses mesh walls to maximise loft and minimise cold spots in key areas
  • Comfort fit: Ergonomic shape and longer zip provide a more human-friendly fit than other ultralight bags
  • SynergyLink™ connectors: Integrate the bag with a mattress for optimal efficiency and comfort; removable for versatility
  • Zoned insulation: Maximises warmth and saves weight by intentionally placing fill where it’s needed most, 70% on the top and sides with 30% on the back
  • Goose down
  • Responsible Down Standard Certified: Certification that ensures that the waterfowl in the down supply chain are treated humanely
  • Additional features: Snag-free zip and cinchable hood
  • Storage sack and compression stuff sack included
  • Left zip only
  • Width: 74cm
  • Length: 216cm
  • Fits: 198cm
  • Shoulder girth: 147cm
  • Hip girth: 130cm
  • Packed dimensions: 15cm x 20cm
  • Manufacturer’s claimed EN comfort rating: 0°C
  • Manufacturer’s claimed EN limit rating: -6°C
  • Manufacturer’s claimed EN extreme rating: -23°C
  • Fill weight: 400 grams
  • Manufacturer’s claimed weight: 625 grams

Close menu