Sonic Down (-20°F / -29°C) Sleeping Bag

$949.95 $879.95

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$949.95 $879.95
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The Backpacker Editor’s Choice Award Winning Sonic™ has been praised as the only bag you really need from -20 to 40 degrees. Now updated for 2019 with a redesigned draft collar and draft tubes to create a secure seal against cold air; overstuffed 800FP hydrophobic, RDS certified down; and an updated profile and shaped footbox, the Sonic™ continues to rock out as the King of Comfort from basecamp to summit.

The contoured hood with drawstring cord creates maximum thermal efficiency, and stretch construction at the knees allows side sleeping. Toester™ footbox is tailored for foot comfort, waterproof/breathable, and includes a layer of synthetic insulation to reduce cold spots.

  • Award-winning design allows for temperature regulation in variable mountain climates.
  • Adjustable Thermo Gills™ vent body heat at your core without letting cold air rush in.
  • Stretch construction at the knees allows side sleeping.
  • Overstuffed with 800FP hydrophobic down that is 100% Responsible Down Standard (RDS) Certified ensuring humane treatment and traceability throughout the supply chain.
  • Redesigned draft collar and draft tubescreate a secure seal to keep cold air out.
  • Redesigned Toester™ waterproof/breathable footbox relies on an additional layer of synthetic insulation to reduce cold spots.
  • Offset zipper creates a thermally efficient seal.
  • Updated profile secures warmth closer to the body.
  • Protected by the NEMO Lifetime Warranty.



  • Compression stuff sack
  • Mesh storage bag
Minimum Weight 1.59 kg1.65 kg
Packed Size41 x 22 cm dia42 x 23 cm dia
Temp Rating-20F / -29C-20F / -29C
Fill Weight960 g1.02 kg
Fits Up To183 cm198 cm
Shoulder Girth155 cm175 cm
Hip Girth147 cm160 cm
Knee Girth135 cm142 cm
Compressed Volume11.9612.47
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