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Thermarest Hyperion 20 UL Regular Sleeping Bag


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Hyperion 20 UL Regular Sleeping Bag
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Product ID: 1372922

Thermarest Hyperion 20 UL Regular Sleeping Bag

Made from 900 fill Nikwax treated hydrophobic down, Thermarest’s Hyperion 20 UL Regular Sleeping Bag provides a huge amount of warmth for very little weight. The treatment means that the down doesn’t absorb moisture and lofts 60 times better than standard down for more warmth, and it is Responsible Down Standard Certified, which ensures that the birds used are humanely treated. As well as using warm, high quality down, the Hyperion has a box wall construction that holds the down in place so that it doesn’t shift and create cold spots. Thermarest has also used a differential fill process, with 70% of the down on the top half of the bag for more targeted insulation.

The ergonomic shape reduces dead space within the bag so it warms up more quickly and there are removable SynergyLink connectors in place which can be used to link it to a Thermarest so that the sleeping bag remains in place overnight. A large storage sack is included that keeps the bag well lofted in storage whilst the compression sack helps when it needs packing away into a rucksack or pannier.


  • 900 fill Nikwax Hydrophobic Down™ : Stays drier and maintains loft 60 times longer than untreated down
  • Unrivaled 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: 72cm
  • Length: 203cm
  • Fits: 183cm
  • Shoulder girth: 145cm
  • Hip girth: 126cm
  • 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: 360 grams
  • Manufacturer’s claimed weight: 580 grams

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