Therm-a-Rest Hyperion 32 Down Sleeping Bag

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Designed for backcountry pursuits, the Therm-a-Rest Hyperion 32 down sleeping bag helps keep your pack featherweight without sacrificing an ounce of performance.

  • Features

    • 900-fill-power Nikwax Hydrophobic Down™ resists moisture and maintains loft up to 60 times longer than untreated down
    • Lightweight materials and precise design allow for a small packed size
    • Thermally efficient box baffled construction uses mesh walls to maximize loft and minimize cold spots in key areas
    • Ergonomic shape and long zipper provide a human-friendly fit
    • SynergyLink™ Connectors integrate the bag with a mattress (not included) 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
    • Shell fabric has been treated with a durable water repellent (DWR) to resist moisture
    • Storage sack and compression stuff sack included
    • Responsible Down Standard certification ensures that the waterfowl in the down supply chain are treated humanely

    Imported.

    Many sleeping bags are rated for temperature by an independent testing protocol. REI and the broader industry now use the International Organization for Standardization (ISO) 23537 protocol, which improves on the older European Norm (EN) 13537 standard; you may still see older items in our assortment that were only EN tested. With either protocol, each bag gets a Comfort (or T-Comfort) rating and Lower Limit (or T-Limit) rating. The Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Ratings are based on a person wearing one long underwear layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38. Many brands use the Comfort rating for women's bags and the Lower Limit rating for men's and unisex bags. Everyone's body and sleep comfort differ, and conditions of use (posture, clothing, sleeping pad R-value, wind, humidity, etc.) affect total insulation, so EN and ISO ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth.
    View the Therm-a-Rest Hyperion Product Line View all Therm-a-Rest Men's Sleeping Bags
  • Technical Specs

    Best Use

    Backpacking

    Tested Lower Limit

    32 degrees (F) - ISO

    Tested Comfort

    41 degrees (F) - ISO

    Temperature Rating (F)

    32 degrees (F)

    Temperature Rating (C)

    0 degrees (C)

    Ultralight

    Yes

    Shell

    Ripstop nylon

    Zipper Location

    Left

    Insulation Type

    Down

    Water-Resistant Down

    Yes

    Fill

    900-fill-power Nikwax Hydrophobic goose down

    Lining

    Ripstop nylon

    Sleeping Bag Shape

    Mummy

    Stuff Sack Size

    5.5 x 6 inches

    Stuff Sack Volume

    3 liters

    Compressed Volume

    2.8 liters

    Gender

    Unisex

    Sustainability

    Down certified to the Responsible Down Standard (RDS)

  • Reviews
    18 reviews with an average rating of 4.1 out of 5 stars

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