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The North Face Inferno Sleeping Bag: -40F Down


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Inferno Sleeping Bag: -40 Degree Down

This Inferno Sleeping Bag is The North Face's warmest expedition bag and is designed for the world's harshest environments. The North Face treated this bag's light and lofty 800-fill down insulation with ProDown water-resistance to retain its warmth in wet weather. Neovent Air fabric adds extra water-resistance to the hood, back, and footbox for moisture-riddled tents. A generous mummy cut helps you layer up before you go to bed, and the half-length center zipper offers easy entry. The North Face also added a cinch-cord at the hood and draft tubes at the collar and overlap to keep frigid winds at bay. This bag also features an internal pocket to insulate electronics and valuables.

  • TNF's warmest expedition bag for the world's harshest environments
  • 800-fill ProDown insulation keeps you warm in -40F temps
  • Neovent Air hood, back, and footbox trap heat without limiting motion
  • Generous mummy cut won't feel like a straight jacket
  • Hood cinch-cord customizes your level of protection
  • Full draft collar and overlap keeps frozen gusts at bay
  • Internal pocket keeps headlamp or map close by
  • Compression and storage sacks included for easy packing
  • Item #TNF01B0

Neovent Air
800-fill ProDown
half-length center
Max User Height
[regular] 6ft, [long] 6ft 7in
Shoulder Circumference
[regular] 64in, [long] 66in
Hip Circumference
[regular] 60in, [long] 62in
Foot Circumference
Bag Length
[regular] 78in, [long] 84in
Draft Tube
collar, overlap
1 storage
Fill Weight
[regular] 2lb 12oz, [long] 2lb 15.8oz
Storage Sack
Stuff Sack
Stuff Size
12 x 22in
Claimed Weight
[regular] 3lb 14oz, [long] 4lb 4oz
Recommended Use
Manufacturer Warranty

Tech Specs

What do you think about this product?


>Rating: 5

Crazy Warm!!

I've used it several times

I used this bag on a recent trip where the temps dipped down into the -10 and it was delightful. While everybody else was shivering and struggling for warmth I was sleeping like a baby. It also packs down pretty tight, I was able to squeeze it into a 5-liter bag and it fits in my pack very well. I really like the baffles that go around your neck and runs along the zipper, they really help keep the cold air out. The material is also pretty breathable which allows moisture to escape and help keep you dry inside the bag.

>Rating: 5

Toasty in 12 Degrees Fahrenheit

I've used it once or twice and have initial impressions

Jordy and I went for a road trip to steamboat springs. We used these bags in freezing weather because winter came early this year! These are so perfectly warm no sweating and also no shivering. The material is so soft and smooth. It’s like a hug from a pillow

>Rating: 4

Sleeping Beauty

I've used it once or twice and have initial impressions

Took this bag winter camping. In temperatures easily under 17 degrees.Felt like sleeping beauty. Because while everyone had a cold hard night. I was warm and asleep till I arose from a slobbery kiss from my sweet 4 legged furry friend.

>Rating: 4

warm and snuggly

I've used it several times

I used this bag for car camping in Canada - it got down to -45 degrees F outside but definitely worth noting that I was in the car and not fully exposed to the elements. That being said it was still very cold, and this kept me super and warm and I was able to sleep well through the night. It's a little roomier inside, which was nice to have for putting my other layers and down jackets inside the bag with me so they'd be warm to put on in the morning and still had plenty of room to sleep comfortably. My only complaint is that the zipper was hard to get out of and would catch sometimes.

>Rating: 4

Mixed (But Mostly Positive) Reviews

I've used it several times

Bag is super warm, high quality construction and packs down impressively small (get a different stuff sack than the one supplied for an even smaller bag). My girlfriend and I took these up on a winter overnighter on San Gorgonio in California. She had the -20 and I had the -40. We both really like the bags, although my favorite thing about the bag was her least. Their is quite a bit of wiggle room inside the bag. Lots of space to move your hips / knees around, sleep on your side, etc. I loved this, but my girlfriend found that all the extra space took her body a long time to heat up, and would have preferred a narrower cut. So anyone looking at these bags, keep that in mind. The other thing to note is the top zipper. We both actually really loved this design, and it makes the bag much easier to get in and out of (or cram a dog inside in the middle of the night). The zipper does have a down baffle covering it, but its fairly easy to accidentally flip the baffle the other way so its not doing its job. I think some sort of velcro system there would be a good idea, especially if you were using this bag down past 0 degrees. For the record it got to about 10 degrees when we were using it, and I got pretty hot and had to stick a shoulder out a few times in the middle of the night to cool off. My girfriend in the -20 was warm and cozy, not overheating like I was.

>Rating: 2

Warm bag but not a -40

I've put it through the wringer

If you're looking for a good -10 or -15 sleeping bag then this would do the job. But this is definitely not suitable for -40. Dont get me wrong its a warm sleeping bag but not that warm. I took it into the sawtooth range in -10 degrees and was pretty warm but it defiantly wasn't as warm as the Lynx -10 by western mountaineering. I do however love the design of the bag! the center zip and the way it sits on the body is great. but the zipper gets snagged all the time. Also I got a bag that stank of dead geese, after washing it it smells fine but having it straight from North Face smelling like dead geese was rather disappointing. Would definitely not buy again. But would look into the Western Mountaineering bags

>Rating: 4

"nuclear reactor" is right!

I get cold, easily. So when I camp in the winter, and it's 10-20 at night, a 0 degree bag is not enough. This thing is WARM. I camped at 9000ft in October and slept like a baby. I will say, I prefer a traditional side zip. This is harder to vent legs and get into

>Rating: 4

Great Expedition Bag

I've used it several times

This is a great expedition bag for any treks, even up over 8000m. I would say it is very comparable to other industry leaders for this niche need. I would say my only real complaint with it would be that I have felt a slight draft in the zipper. There isn't a real collar to cover this, and so I did have a slight breeze. The outer material isn't the top of the line for moisture resistant but it does help keeping the down dry. I"m 6' and I did just fit into the regular size bag. I would say it would be nice to have a little bit extra room though to stuff, boot liners, clothes, stove, or other necessities into the bag with you at night to keep from freezing. To test the warmth of it, I had my fiance bring it out on her first winter expedition with our pup, and they both approved as it only got down to about 15 degrees that night! Feel free to reach directly out to me with any questions on this bag or anything else for your next big expedition!


Hey Travis! I'm currently looking for a down bag for Denali. Do you think this would hold up for that? I've heard the inferno -20F, Marmot Col -20F could be options as well as the MH Wraith (but from my understanding the wraith was discontinued). What're your thoughts on this? Thanks! Will,

>Rating: 3

Warm but restrictive

I've put it through the wringer

No doubt this bag is a nuclear reactor. I used it for a recent ascent of Aconcagua and was never in the vicinity of cold. Quite the opposite. I was hot most nights and couldn't effectively vent the bag without exposing the entire upper half of my body. Guide said we needed a -20/-30 F bag for the expedition so I bought this. If I were to choose again, I would choose a -20F with a traditional zipper all the way down the side to allow ventilation. I still like the bag though. Likes: - Very warm - Very lightweight and compressible for the rating - Appears durable Dislikes - Center zipper means your leg movement is a little restricted. If you're claustrophobic at all, this is not your bag. - No way to vent your legs. I think a good idea would be to add a zippered vent somewhere on the bottom half of the bag to cool down when temps are higher. When mountaineering coldest temps only experienced at highest camps and this bag is totally overkill at lower/base camps. - The zipper itself is hard to zip all the way up when you're in the bag. It's not a big robust, easy-close plasticized metal zipper, perhaps because they vent too much. I had a hard time zipping all the way up to my chin. Required major contortions on my part.

Thank you for the great review Bob! If you have gear questions feel free to reach out to me directly. (801)204-4683

>Rating: 5

little spec break down

I've used it once or twice and have initial impressions

Length: 84 in / 213.36 cm Packed Size: 22 x 12 in / 56 x 30 cm Material: ProDown Shoulder Girth: 62 in / 157 cm Fill Weight: 3 lbs 9 oz / 1.6 kg Temp Rating: -40 F / -40 C Age Group: Adult


Kind of insane that the weight isn't listed here...

Gregg, Really sorry. With as many products as we've got on our site, every now and then we miss a small detail. Here are the weights: Regular: 3 lbs 14 oz Long: 4 lbs 4 oz. Hope this helps!


Hola haces envios a argentina?

Hola Guillermo, En Recursos en la parte inferior se puede hacer clic sobre " la política internacional de envío" . Una vez allí, en la columna de la izquierda , hay una que dice: " no podemos enviar a ciertos países " bajo órdenes internacionales . No vi a Argentina en la lista. Usted puede intentar llamar a atención al cliente y ver si tienen a alguien que hable español para ayudarle. Buena suerte.


I'm 6ft, do the regular size will be to just for me ?

Yep! Usually if a bag is labelled "6ft", there is a little extra room in there. I'm 6ft and always go with the "regular" or "6ft" option. Ben


Will this be warm enough for climbing Mt Denali?

Akram, This -40 bag will definitely be warm enough. If you're a cold sleeper then you'll want to wear additional layers to bed and make sure you eat and drink a bunch / exercise before bed. Shoot me an email anytime you have questions! Jared D. Expert Gearhead 801.736.4336


Why do they not list the fill weight... Arghh. Anyone know what it is?

Chris, Here is the fill weight for this bag: Regular: 2lb 12oz Long: 2lb 15.8oz Let me know if you've got more questions about this bag or any other gear! Jared D. Expert Gearhead 801.736.4336



Hey Jim P. Thanks for your question. The regular bag weighs 3 lbs 14 oz and the long weighs 4 lbs 4 oz.