Therm-a-Rest - Hyperion 20

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  • Regular price $451.00

Weighing a mere 1 lb. 4 oz, defy the cold and rest better while moving through the mountains with the Hyperion.

Built to provide a featherlight pack weight and high-performance warmth, the Hyperion 20F/-6C 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, the Hyperion keeps your pack light, giving you the freedom to move quickly in the backcountry. Storage sack and compression stuff sack included.


  • 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 maximize loft and minimize 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: Maximizes 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.


  • 540g (Small)
  • 570g (Regular)
  • 620g (Long)
  • Nikwax Hydrophobic Down
  • ThermaCapture
  • Construction Baffle Face fabric
  • 10-denier nylon Lining
Temperature Rating
Comfort Rating:  0°C
Limit Rating: -6°C
Shoulder girth
  • 140cm (Small)
  • 145cm (Regular)
  • 147cm (Long)
Hip girth
  • 126cm (Small)
  • 126cm (Regular)
  • 130cm (Long)
Foot girth
  • 102cm (Small)
  • 109cm (Regular)
  • 117cm (Long)
  • Small fits to 5' 6" (168 cm)
  • Regular fits to 6' 0" (183 cm)
  • Long fits to 6' 6" (198 cm)
Additional feature(s)
  • Draft tube behind zipper
  • DWR-treated shell fabric
  • Home storage sack included
  • Sleeping pad sleeve or straps
  • Stuff sack included
  • Ultralight
  • Product sustainability Certified Responsible Down
  • Made in China