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Thermarest Hyperion -6C Sleeping Bag

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The Thermarest Hyperion -6C Sleeping Bag weighs just 539g. It defies the cold and provides better rest while moving through the mountains.

Built to provide a featherlight pack weight and high-performance warmth, the Hyperion 20F/-6C sleeping bag is among the lightest in its class without sacrificing an ounce of performance.

The bag uses thermally-efficient box baffled construction in key areas to ensure warmth and comfort in an ultralight package.

Designed with high-quality materials and Therm-a-Rest performance features like SynergyLink Connectors, the Hyperion keeps your pack light, giving you the freedom to move quickly in the backcountry. 

  • Ultralight: One of the lightest pieces in its class, the Hyperion sets a new standard for high-performance outdoor equipment.
  • 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 zipper 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 you need it most, 70% on the top and sides with 30% on the back.
  • Responsible Down Standard Certified: Certification that ensures that the waterfowl in the down supply chain are treated humanely.
  • Storage sack and compression stuff sack included.
  • Colour: Deep Pacific
  • Packed dimensions: 15x20cm
  • Comfort: 0°C
  • Limit: -6°C
  • Liner fabric: 10D Nylon RipStop Therma-Capture
  • Shell fabric: 10D Nylon RipStop w/DWR
  • Fill: 900 Fill Goose Nikwax Hydrophobic Down, RDS
  • Fill weight: 325g
  • Zipper side: Left


  • Length: Fits 168cm (5ft 6")
  • Weight: 539g
  • Girth, Shoulder: 140 cm
  • Girth, Hip: 123 cm
  • Girth, Foot box: 102 cm


  • Length: Fits 183cm (6ft)
  • Weight: 567g
  • Girth, Shoulder: 145 cm
  • Girth, Hip: 126 cm
  • Girth, Foot box: 109 cm


  • Length: Fits 198cm (6ft 6")
  • Weight: 624g
  • Girth, Shoulder: 147 cm
  • Girth, Hip: 130 cm
  • Girth, Foot box: 117 cm