Award-winning design has been updated for even greater warmth retention and adjustability across temperatures
Second-generation Thermo Gill™ vents extend the comfort range with a new multi-stage zipper system
Chevron baffle construction better compartmentalizes down for a more uniform loft and down migration prevention
Stretch construction at the knees for comfortable side sleeping
Offset zipper creates a thermally efficient seal while an update profile secures warmth closer to the body
Includes a compression sack for easy storage and travel
Technology:
Overstuffed with premium 800 FP hydrophobic down that is PFC-Free and 100% Responsible Down Standard certified, ensuring humane treatment and traceability throughout the supply chain
Toester™ waterproof and breathable footbox utilizes a layer of synthetic insulation to protect the down and deliver maximum toastiness for toes
Additional Details:
Constructed with 100% recycled bluesign® approved shell and liner fabrics, making it an eco-friendly addition to your gear
Brand : NEMO
Country of Origin : Imported
Web ID: 24VYOUSNC0SHRTXXXCSL
SKU: 25022774
Shape
Mummy
Temp Rating
0° (F) / -18° (c)
Comfort Temp*
14° (F) - ISO
Limit Temp*
0° (F) - ISO
Insulation Type
Down
Fill Power
800-Fill-power down
Shell Fabric
Recycled nylon
Zipper Location
Left
REVIEWS
4.8
100%
Recommended
10 Reviews
Ben
6 months ago
Toasty Warm
I used the -20F Sonic for the first time camping at the trailhead of the Four Pass Loop in Crested Butte CO. It kept me toasty warm and comfortable in the low 30s with both gills open, and I loved that the hood design stayed on my head all night. This bag was so much better than my 15F Riff (which I froze in if the temperature dropped below 45F). I maintain the Nemo sleeping bag warmth ratings are misleading for their Men's bags.
Jeff
1 year ago
First Impressions
This is a first impression as I have not had an opportunity to sleep outside with it yet. Using synthetic fill for the footbox area is a nice detail. The zippers on the venting "gills" are VERY small and even in brief testing, they sometimes catch on the fabric.
CodyC
1 year ago
Best 0 Degree Bag I've Owned!
I recently purchased the 0 degree bag for a bike-to-ski trip in Iceland, so I needed it to work in a variety of conditions (cold, wet, snowy, windy, you name it), and be versatile enough to pack into panniers, backpacks, and beyond. The bag was perfect and outperformed my expectations. I stayed warm on cold nights and loved the ability to open the gills for added breathability, which was crucial in never feeling too swampy if it was a warm night. I ended up swapping the stock stuff sack for a waterproof compression sack, and it packed down quite small for a 0 degree, fitting well into my panniers and 35L backpack when skiing. I'm 5'9" and the regular length fit me well - my pillow tucked very nice and snugly into the hood, so sleeping was always quite comfy and cozy. No complaints, issues, etc. Happy customer here!
Jen73
Verified Purchase
2 years ago
Roomy Bag
It was time to upgrade my bag finally…my old bag was so insanely uncomfortable and only a 20* and I’m a colder sleeper, so I went on a hunt for a 0* bag. I haven’t had an opportunity to take this guy out but let me tell you…it’s so nice and roomy and has enough space for my camping cat. Love the vent features…they unzip on the outside and inside. Can’t wait to take it backpacking.
Jon M
Verified Purchase
2 years ago
Poofy, Roomy And Warm
I currently live in my minivan I built out and am traveling and working in Southern Oregon. I tried the Nemo Forte rated at 20 degrees and it was not warm and clearly not rated correctly.. so I returned. Outside temps were around 30 deg. I got this Nemo Sonic sleeping bag rated @ 0 deg and it has been wonderful and rated much more accurately. I am comfortable/warm sleeping in 20 deg weather. I recommend. It’s expensive but worth it.. nothing worse than not getting good rest while traveling in van. Thumbs up. Ps. I chose this sleeping bag in particular because I’m a side sleeper and like to have freedom of movement rather than a typical mummy sleeping bag. It’s great.
Oehlert
Verified Purchase
2 years ago
Fall In Alaska
Worked perfectly for a fall bear hunt in Alaska. I am 6’1” and purchased the XL and in was nice with a little length to spare.
MP32
Verified Purchase
3 years ago
Perfect Fit!
After a couple of nights in this bag I can already say I made the right choice. Some reviews have said it doesn’t stay as warm as some competitors due to the extra space inside but for me the slightly larger size more than makes up for that in comfort as a side sleeper. I’m 6’1 and JUST squeeze into the bag with the hood up with the normal length bag. So far so good!
Martin
3 years ago
Outstanding Sleeping Bag
I bought this in time for my 4 day solo backcountry hunt. Temperatures were projected to be in the mid teens at night, but a cold snap occurred and dropped down to single digits (Fahrenheit). This bag saved my trip. It was so warm that I was able to sleep in my boxers. I'm 6'2" tall and 230 pounds. The long bag allowed for plenty of space to move freely. My size 14 feet didn't feel cramped in the toe box. Condensation in the morning was easily brushed off with a towel in the morning and the bag always dried quickly. I don't think the insulation ever got wet. The baffle cinches with an elastic cord and traps in the heat. The gills did a great job of regulating heat. I think it packs down to a reasonable size with the stuff sack, and I think the stuff sack was well-matched. I don't believe I could have compressed the bag much more. There's a pocket near the zipper, just below the face opening. This fit my Iphone 12 mini, but I don't think it would fit anything much larger. I have suggestions for the design in the future. Because of the wallet/phone pocket's location, in the morning, it was usually covered with condensation. This made trying to open the pocket only slightly more difficult, but was still annoying to deal with the cold and damp. It's also not accessible unless I were to open the main zipper and let out heat. I'd prefer a pouch, interior to the bag. This way it's insulated from freezing temperatures. The baffle velcro could be a bit stronger too, or designed to sandwich between flaps for better purchase. But these are very minor issues. What matters most is that the bag is warm, roomy, dry, and of a reasonable weight and pack size. Having this bag has opened up so many more opportunities for cold weather outtings that I cannot wait to explore.
Sacha
Verified Purchase
3 years ago
Well Made
The bag is well made and the temperature gills are nice feature. Though it's wider than typical mummy bags, it's still a bit too narrow for me being a side sleeper.
MrClark
Verified Purchase
3 years ago
Great Bag With Lots Of Features!
This bag has been great! I’ve had the chance to use it in 10 degree weather and I’m a cold sleeper. I did have thermals on and it kept me comfortable. I wasn’t sure how functional the thermo gills would be but they actually do a great job of adjusting the temp in the bag. One thing you might not notice without seeing it in person is that the gills have 2 sets of zippers, one outside the bag and another inside. This helps further with temp control. The foot box kept my feet warm with wool socks on. Last thing I’ll say is it’s nice that it is a bit more spacious. I’m a side sleeper and if my pooch is ever with me he can sneak in. Overall, great bag!
