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Nemo's Sonic™ series has been praised as the only bag you really need all the way from -20 to 40 degrees Fahrenheit. Their proprietary Thermo Gill™ vents allow you to release heat on milder nights, vastly extending the comfort range. Stretch stitching in the legs minimizes extra air volume you need to heat up.

Waterproof/breathable fabric over the footbox protects against frost and condensation on tent walls. Over-stuffed with 800FO hydrophobic, RDS certified down, Sonic™ is fine-tuned for frigid weather.

Ascent 900 XL, -18C / 0F

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