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.


  • 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


Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: 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. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Therm-a-Rest Backpacking Sleeping Bags

Technical Specs

Best Use


Tested Lower Limit

0 degrees (F) - ISO

Tested Comfort

14 degrees (F) - ISO

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

19 reviews with an average rating of 4.5 out of 5 stars

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