Therm-a-Rest Polar Ranger -20 Sleeping Bag

$789.95 – $839.95

Built for the coldest places, this Therm-a-Rest sleeping bag is filled with premium 800-fill-power down. It features a snorkel hood. The side vents allow airflow and free your arms to access gear.

Location Image of color Flame/Goblin Blue

Fill

800-fill-power PFAS-free hydrophobic duck down, RDS

Weight

Regular: 3 lbs. 4.8 oz.

Long: 3 lbs. 6.4 oz.

Compressed Volume

Regular: 15.6 liters

Long: 17.5 liters

Temperature Rating (F)

-20 degrees (F)

Designed in partnership with renowned polar explorer Eric Larsen
800-fill-power, water-resistant down provides excellent loft, warmth and compression for great packability
Responsible Down Standard (RDS) certification ensures the waterfowl in the down supply chain are treated humanely
Box-baffled construction
Recycled shell and liner; PFAS-free, 100% recycled fabrics are eco-friendly while being lightweight, soft and durable
Antisnag YKK® zipper ensures easy entries and exits, and prevents tears
Full-featured snorkel hood: Shorter, stiffer snorkel features condensation-resistant synthetic insulation; it allows for easy breathing and ventilates exhaled moisture
Magnetic snorkel closure keeps cross-drafts at bay and eases entry and exit
Side vents zip open for external arm use and allow customizable temperature control; overlapping draft tubes prevent cold spots when closed
Drafts are kept at bay by extensive, overstuffed draft tubes
Cinchable draft collar
Toe-asis™ foot warmer pocket rapidly heats cold feet with a baffled, ergonomic and insulated pocket in the footbox that helps concentrate warmth
External loops for attaching a quilt or blanket for more warmth
Refined fit was tested and perfected; added width and precise down distribution achieve optimal thermal efficiency and comfort

Imported.

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

Best Use	Backpacking
Tested Lower Limit	-20 degrees (F) - ISO
Tested Comfort	-4 degrees (F) - ISO
Temperature Rating (F)	-20 degrees (F)
Temperature Rating (C)	-30 degrees (C)
Weight	Regular: 3 lbs. 4.8 oz. Long: 3 lbs. 6.4 oz.
Ultralight	Yes
Shell	100% recycled nylon
Zipper Location	Front
Insulation Type	Down
Water-Resistant Down	Yes
Fill	800-fill-power PFAS-free hydrophobic duck down, RDS
Fill Weight	Regular: 2 lbs. 1.6 oz. Long: 2 lbs. 6.4 oz.
Sleeping Capacity	1-person
Lining	100% recycled nylon
Sleeping Bag Shape	Mummy
Fits Up To (in.)	Regular: 72 inches Long: 78 inches
Shoulder Girth (in.)	Regular: 64 inches Long: 68 inches
Hip Girth (in.)	Regular: 59 inches Long: 60 inches
Stuff Sack Size	8.625 x 23 inches
Stuff Sack Volume	22.1
Compressed Volume	Regular: 15.6 liters Long: 17.5 liters
Gender	Unisex