Therm-a-Rest Parsec 0 Sleeping Bag

$529.95to $619.95
Color: Yellow
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Whether on an overnight snowshoe trip, a ski tour or just a quiet, off-season backpacking trek, the packable Therm-a-Rest Parsec 0 sleeping bag provides plenty of warmth for winter pursuits.

  • Features

    • 20-denier recycled nylon shell is soft, durable and lightweight
    • 100% recycled nylon shell and liner are certified to the Global Recycled Standard
    • 800-fill-power Nikwax Hydrophobic Down™ absorbs 90% less water and dries 3 times faster than untreated down to keep you warm and dry in wet conditions
    • Down is PFC-free and certified to the Responsible Down Standard
    • Refined shape adds a bit of girth in the shoulder to accommodate more clothing layers while shaving up to 2 oz. off the previous version
    • Heat-mapped, zoned insulation delivers an elite warmth-to-weight ratio by allocating insulation to where you need it and reducing it where you don't
    • No-snag YKK® zipper eases entry and exit and prevents accidental tears
    • Cinchable hood, heat-trapping draft collar and full-length zipper draft tube help keep heat in
    • Down-lined Toe-asis™ foot pocket helps keep your feet warm in the dead of winter
    • Improved—and optional—SynergyLink™ connectors strap to your sleeping pad to give you freedom of movement without shifting off the pad and losing warmth
    • External zippered pocket stashes small essentials
    • Quilt and blanket loops let you customize your sleep system by layering a Therm-a-Rest quilt or technical blanket for increased warmth (quilt/blanket not included)
    • Compression and storage sack included


    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 all Therm-a-Rest Backpacking Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    0 degrees (F) - EN

    Tested Comfort

    14 degrees (F) - EN

    Temperature Rating (F)

    0 degrees (F)

    Temperature Rating (C)

    -18 degrees (C)


    Small: 2 lbs. 2 oz.

    Regular: 2 lbs. 6 oz.

    Long: 2 lbs. 9 oz.



    Zipper Location


    Insulation Type


    Water-Resistant Down



    800-fill-power Nikwax Hydrophobic Down



    Sleeping Bag Shape


    Fits Up To (in.)

    Small: 66 inches

    Regular: 72 inches

    Long: 78 inches

    Shoulder Girth (in.)

    Small: 58 inches

    Regular: 63 inches

    Long: 66 inches

    Hip Girth (in.)

    Small: 57 inches

    Regular: 58 inches

    Long: 59 inches




    Down certified to the Responsible Down Standard (RDS)

    Contains recycled materials

  • Reviews
    14 reviews with an average rating of 4.6 out of 5 stars

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