SKU: 598678379

Nemo Sonic -20F/-29C Sleeping Bag

Sale price$396.00 Regular price$440.00
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Description

Nemo Sonic -20F/-29C Sleeping BagThe ultimate mountain sleeping bag Built to be the only bag you need from 20F to 40F, Nemo has updated their Backpacker Editors Choice award winning big mountain bag, Sonic, for even greater warmth, tuneability, and reduced environmental impact. With this bag, we are launching our next generation Thermo Gills with a new multistage zipper system that dramatically increases the usable temperature range of the bag and allows fine tuning of comfort from

The ultimate mountain sleeping bag

Built to be the only bag you need from -20°F to 40°F, Nemo has updated their Backpacker Editors’ Choice award-winning big-mountain bag, Sonic, for even greater warmth, tuneability, and reduced environmental impact.

With this bag, we are launching our next-generation Thermo Gills™ with a new multistage zipper system that dramatically increases the usable temperature range of the bag and allows fine-tuning of comfort from within the bag. Sonic’s new chevron baffle construction better compartmentalizes down, eliminating migration and keeping the down evenly lofted. Not to mention, it looks awesome. In updating the bag's design, we put a high priority on taking a leap forward in sustainability.

The shell and liner fabrics are 100% recycled and bluesign® approved. The premium 800 FP hydrophobic down is 100% Responsible Down Standard (RDS) certified. We also took years of history in the field to make detailed upgrades, including massaging the profile of the bag, redesigning the draft collar, and bolstering the draft tubes. Our proven Toester™ footbox keeps feet warmer, provides a waterproof barrier against tent wall condensation, and protects down from moisture while drying damp clothes inside the footbox. Adaptable to whatever the mountain throws at it, Sonic continues to reverberate as the ultimate extreme weather companion.

Details

  • Award-winning design is updated for even greater warmth retention and adjustability across temperatures.
  • Updated design incorporates 100% recycled, bluesign® approved shell and liner fabrics.
  • Updated Thermo Gills™ extend the comfort range with a new multistage zipper system.
  • Overstuffed with premium 800 FP hydrophobic down that is PFC-Free and 100% Responsible Down Standard (RDS) certified, ensuring humane treatment and traceability throughout the supply chain.
  • New chevron baffle construction better compartmentalizes down for more uniform loft and down migration prevention.
  • Stretch construction at the knees for comfortable side sleeping.
  • Redesigned draft collar and draft tubes keep cold air out.
  •  Redesigned Toester™ waterproof/breathable footbox utilizes a layer of synthetic insulation to protect the down and deliver maximum toastiness for toes.
  • Offset zipper creates a thermally efficient seal while an updated profile secures warmth closer to the body.
  • Protected by the NEMO Lifetime Warranty.

 

    What's Included

    • Compression stuff sack   

      Best Use

      • Winter Camping
      • Mountaineering

      Construction & Materials

      Shell Fabric 20D 100% Recycled Nylon, Bluesign Certified Ripstop w/ DWR
      Footbox Fabric 40D 100% Recycled Nylon, Bluesign Certified Ripstop W/B w/ DWR
      Lining Fabric 20D 100% Recycled Polyester, Bluesign Certified Taffeta w/ DWR
      Color Goodnight Gray / Torch
      Zipper Location Left
      Stuff Sack Compression stuff sack
      Insulation 800 FP Down


      Specs & Sizing

      Capacity 1
      Minimum Weight 3 lb , 14 oz / 1.76 kg
      Packed Size 14.5 x 10.5 in dia / 37 x 27 cm dia
      Temp Rating -20F / -29C
      ISO Lower Limit F / C
      Fill Type Down
      Fill Weight 2 lb , 5 oz / 1.06 kg
      Fits Up To 6' / 183 cm
      Shoulder Girth 63 in / 160 cm
      Hip Girth 58 in / 147 cm
      Knee Girth 53 in / 135 cm
      Compressed Volume 12.5
      Shipping Notes
      • Free Standard Shipping on $100+ Orders to the USA.
      • Except Preorder products are shipped in 48 hours.
      • Delivery to the USA:
      1. Standard Shipping : 3-10 business days
      • If time is of the essence, please consider selecting expedited delivery for faster service.
      Exchange/Return Notes
      • We offer a 30-day return/exchange service after receiving.
      • Final sale items are not eligible for returns or exchanges.
      • To process your return/exchange, please contact us at [email protected]
      • Please click here for more details>>> Return & Exchange Policy
      SKU: 598678379

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      4.4 ★★★★★
      Based on 17 reviews
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      S
      Verified Purchase
      SeanCeltiad
      Louisville, US
      ★★★★★ 4
      A true turtleneck that retains a snug high neck.
      Color: White, Size: X-Large
      I've found this brand to have gotten better over the years as far as offering the American market what it needs in terms of realistic sizing. I only wish they'd realize that there are a lot of us who are long in the back and arms where my only choice is to go a size up and sacrifice a slim fit for sleeves that are long enough plus a back that doesn't go up past my waist just because I reach up for something, that and I like to be warm. So these are such nice quality turtlenecks that it's hard to complain about but maybe the company will read this. The snug neck stays up is plus number one since that's why I'm buying a full neck. They come with very nice weaves in the fabric, good enough for casual or formal wear. Finally the warmth you seek is there but I've worn them in what most would think isn't the right temp for a turtleneck. Also they have them in white! Yes, a lot of others just don't for reasons I can't fathom, and the pic you're seeing is accurate, these will form to your shape without being ridiculously thin material. Several washes later and they are as fine a garment as when I first wore them. I've only found one other brand that compares to these but it's much more expensive, COOFANDY is affordable in these times of expensive everything. Warm but also a lightweight shirt, I've gotten them really dirty with actual dirt and it washes out so well you'd never know it. Don't let my taking off one star stop you, try one yourself and you'll be coming back for more.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on July 30, 2025
      L
      Verified Purchase
      Larry
      Lexington, US
      ★★★★★ 5
      Quality,warmth and fit
      Color: Royal Blue, Size: Small
      Really top quality. This is my 4th purchase of these Really great sweaters.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on February 12, 2026
      R
      Verified Purchase
      Robert III
      Lexington, US
      ★★★★★ 5
      Nice Sweater
      Color: 01-black, Size: Large
      This is a very nice sweater. It’s reasonably thick and warm. Looks nice. I like it.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on January 18, 2026
      T
      Verified Purchase
      Tajuana Perkins
      Waukegan, US
      ★★★★★ 5
      Nice turtle neck sweater
      Color: Royal Blue, Size: Small
      It was true to size a perfect fit and the color is beautiful. Nice sweater for the amount paid.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on January 11, 2026
      N
      Verified Purchase
      Nathalie M. Rosario Escobar
      Whiting, US
      ★★★★★ 5
      Very good
      Color: 01-black, Size: Small
      It looks so good on my bf, he really like it. The quality is so perfect.
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on January 15, 2026

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