NEMO Sonic Down Sleeping Bag

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Product Details

The Backpacker Editor’s Choice Award Winning Sonic™ has been praised as the only bag you really need from -20 to 40 degrees. The premium suite of fabrics and 850 fill power down is complemented by adjustable Thermo Gills™, which regulate temperature without letting cold drafts in. It’s made for variable mountain climates.

Stretch construction at the knees offers extra room for side sleeping or to change positions during the night, as well maintaining the bag shape, thermal efficiency, and loft. An oversized draft collar with a Velcro closure seals in heat and keeps cold air out, and the waterproof/breathable footbox keeps your feet toasty and warm. This bag was made to keep you warm and comfortable in variable mountain climates.


  • 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.
  • 850 Fill Power down is 100% Responsible Down Standard (RDS) Certified – it is traceable and ensures humane treatment throughout the supply chain.
  • Oversized draft collar seals in heat and keeps cold air out.
  • Waterproof/breathable footboxkeeps feet warm.
  • Offset zipper creates a thermally efficient seal.
  • Best Use - Mountaineering
  • Patent pending.


  • Compression stuff sack
  • Cotton storage bag


Minimum Weight2 lb , 10 oz / 1.2 kg2 lb , 14 oz / 1.31 kg
Packed Size18.0 x 11.0 in dia / 46 x 28 cm dia18.0 x 11.0 in dia / 46 x 28 cm dia
Temp Rating0F / -18C0F / -18C
Fill TypeDownDown
Fill Weight1 lb , 8 oz / 670 g 1 lb , 9 oz / 710 g
Fits Up To6' / 183 cm6'6" / 198 cm
Shoulder Girth61 in / 155 cm69 in / 175 cm
Hip Girth58 in / 147 cm63 in / 160 cm
Knee Girth53 in / 135 cm56 in / 142 cm
Compressed Volume7.78.9


Shell Fabric20D Nylon Ripstop w/ DWR
Footbox Fabric40D Nylon Ripstop OSMO™ w/ DWR
Lining Fabric20D Nylon Micro Ripstop w/ DWR
ColorGranite / Sunburst Yellow
Zipper LocationLeft
Stuff SackCompression stuff sack, Cotton storage bag
Insulation850 FP Down
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