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Sure, maybe you're absolutely nuts to be out in this weather, but at least you can rely on The North Face Dark Star -40 Degree Synthetic Sleeping Bag to keep you safe and warm, even at the top of the world at night. How to stay warm during the day is a different issue altogether.

  • Ultralight Pertex ripstop shell is highly breathable and resists abrasion and wind like a champ
  • ClimaShield Prism’s densely packed synthetic fibers trap more heat than standard synthetics and help the insulation retain greater loft despite repeated compressions
  • ClimaShield Apex’s fine-denier fibers reflect radiant heat back to you for a warmer night's sleep
  • Vaulted footbed won’t constrict your feet, and it helps promote circulation to your lower extremities
  • Expedition-grade draft collar seals in the warmth
  • Ergonomically shaped hood provides extra comfort, improves the bag’s warmth-retention, and reduces its overall weight
  • Included compression stuff sack doubles as a ultralight bag for your summit bid
  • The North Face Summit Series
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  • Q & A

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Best warmth , top of the line

    Ive got the first version of this bag about two years ago with a big red stripe in the middle gotta say besides its super warm it has a collar super adjustable hood , glow in dark zipper handle , pocket for head lamp/flashlight etc.

    the only disadvantage is size.. i can deal with 6lb but the compression alone will take 40-50 litter pack easy. but overall size/price/warmth it still worth it because -20F+liner or 0F + few liners will weight and take as much size

    what are advantages/disadvantages to...

    what are advantages/disadvantages to synthetic or down?

    Most simply put (and there is a very long winder version of this) but down insulation is more compressible, provides more warmth for the weight, and is more durable. The down side is it loses all loft and insulative properties when wet. This is where synthetics shine. They still insulate when wet. They are also a fair amount cheaper than down, and don't come from an animal product.


    Down: Lighter, packs smaller, warmer for the weight, longer product lifetime.

    Synthetic: Still insulates when wet, cheaper, not from animals.


    Down: Expensive, won't insulate when wet, animal product (some people are allergic).

    Synthetic: Heavier, takes up more room.

    Last but not least...

    Many people prefer the fluffy, light feel of down; that's why lots of comforters are made from it. Also, gearheads often choose down over synthetic (unless they KNOW it will get wet) ... so when you choose down, you do get the vanity factor of looking pro.

    Any thoughts if the included compression...

    Any thoughts if the included compression stuff sack is water proof/ water resistant? Thank you.