Thermarest Hyperion 20F/-6C

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As low as €467.96 Regular Price €519.95
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Insulation Down
Comfort temperature -10° / 0°
Weight 500 - 750g

Quick overview

The Thermarest 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, the Hyperion keeps your pack light, giving you the freedom to move quickly in the backcountry.


Mummy sleeping bag
A mummy-shaped sleeping bag offers several advantages. The close-fitting shape means there is less room for air in the sleeping bag. You'll have the air that's in there up to temperature faster, making the sleeping bag warmer than a rectangular model. Also, most mummy sleeping bags come with a hood and a collar just above the shoulders that you can tighten. These features keep the heat trapped inside the sleeping bag and protect your head and neck, where you lose the most heat. The tapered shape reduces weight and volume in your backpack, bike pannier or car trunk.

Down insulation has an excellent insulation-to-weight ratio. It is very compressible, so a bulky, warm sleeping bag, can still be reduced to a small, manageable package. Also, the weight of a down-filled sleeping bag is much lower than that of a synthetic-filled sleeping bag with a similar temperature range. The temperature range of down is greater than synthetic materials such as polyester. This means that a warm sleeping bag can be used comfortably even at higher temperatures. Finally, down has a much longer lifespan.


  • 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
  • Storage sack and compression stuff sack included


Thermarest Hyperion 20F/-6C S R L
Comfort °C 0 °C
Limit °C -6 °C
Extreme °C -23 °C
Fill weight (grams) 330 360 400
Weight (grams) 550 580 630
Insulation material 900-Fill Nikwax Hydrophobic Down™, RDS
Up to bodysize (cm) 168 183 198
Girth @ shoulder / hip / foot (cm) 140 / 123 / 102 145 / 126 / 109 147 / 130 / 117
Packed dimensions (cm) 15x20
Intended use Fast & Light