Here's what other sites are saying:
The Nemo Sonic Negative 20-Degree Down Sleeping Bag - The Nemo Sonic Negative 20-Degree Down Sleeping Bag rocks out as the king of comfort and security from basecamp to summit. Now updated for 2019 with a redesigned draft collar and tubes to create a seal against cold air, the Sonic has been praised as the only bag you really need from -20F to 40F.
From basecamp to summit to snow cave, bask in 850-fill-power down comfort with the NEMO Sonic Down -20 sleeping bag. Adjustable Thermo Gills(TM) regulate temperature without letting cold drafts in.
Your NEMO Equipment Inc. Sonic -20 Degree Down Sleeping Bag provides cozy relief from brutal winter chill. This toasty bag can handle frigid temps while you're putting in high camp on an unsupported expedition, but the ventilation allows for comfortable use in warmer weather as well. The 850-fill down is lightweight and compressible, making it easy to stuff in your pack for a multi-day traverse, and the DWR-treated nylon ripstop material fights off moisture and withstands wear and tear from life on the trail. The draft collar seals in heat and keeps chilly air out, while Thermo Gills allow efficient ventilation in the warmer months.
Nemo Camp & Hike Sonic -20 Sleeping Bag Long 814041018685.
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