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  • Marmot - Never Summer Sleeping Bag: 0 Degree Down -

Marmot Never Summer Sleeping Bag: 0 Degree Down

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25 Reviews


Make an effort to ditch the crowds.

Summer might bring mild weather, but it also brings crowded trails, so use frigid winter temps to your advantage and head to the mountains with your Marmot Never Summer 0 Degree Down Sleeping Bag once the temperatures drop. Stuffed full of Marmot's water-resistant Down Defender 650-fill down, the Never Summer is rated to keep you warm when temperatures drop to single digits, and its ripstop fabric has been treated with a DWR coating for a bit more protection from light snow flurries and condensation that might accumulate along the walls of your tent. The Never Summer bag has a basic mummy shape with an anatomic footbox to give your feet some extra room to roam, a Nautilus hood that cinches down tightly around your noggin, and a full-length zipper that's backed by a snag-free insulated draft tube to help prevent heat loss through the zipper. There are also internal stash pockets the make it easy to keep your headlamp and a small midnight snack where you can reach them.

  • 0-degree temperature rating
  • 650-fill down insulation with Down Defender treatment
  • Mummy shape with anatomic footbox
  • 30D ripstop nylon with DWR finish
  • Nautilus multi-baffle hood
  • Full-length left- or right-handed zipper
  • Ground level side seams
  • Internal stash pockets
  • Item #MAR00T6

Tech Specs

30D nylon ripstop, DWR finish
650-fill down, Down Defender treatment
Max User Height
[regular] 6 ft, [long] 6 ft 6 in
Shoulder Circumference
[regular] 62, [long] 64
Hip Circumference
[regular] 56, [long] 58
Foot Circumference
[regular] 41, [long] 43
Bag Length
[regular] 83, [long] 89
Draft Tube
1 interior
0 F
Stuff Sack
Stuff Size
8.5 x 18 in
Claimed Weight
[regular] 3 lb 1 oz, [long] 3 lb 4 oz
Recommended Use
winter camping, backpacking
Manufacturer Warranty

Tech Specs

  • Reviews
  • Q & A

What do you think about this product?

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Spent a number of nights on snow near 0

  • Familiarity: I've used it several times

I decided to take my Marmot Never Summer out on a mountainside one more time to see how it fared once more in temps near 0-degrees Fahrenheit, and again, I was not disappointed. I had a cheap sleeping bag liner for just in case, but I decided to stick to my regular setup instead of the added insulation for this last test prior to my review. I had on the Smartwool Mountaineering socks with the Smartwool ski socks on top of them. I had a Columbia mightweight top and bottom baselayer. Then an Under Armour 3.0 top on top of the Columbia top. Then light and comfy fleece on top of these two thermals on my upper body. A very light pair of Patagonia hiking pants on top of the thermals on my lower body. Though I had Under Armour 3.0 bottoms too, I decided against them. Then an Outdoor Research windstopper balaclava and a cheaper beanie. Per a suggestion of a friend of mine with much more experience than me, I used two sleeping pads--the Therm-a-Rest RidgeRest LG foam pad beneath the the ProLite Plus LG (I'm tall) inflatable pad. All of this, including myself, was inside a NorthFace Triarch 1 solo tent. This was all on top of snow at approximately 7100 feet in elevation, at an exposed camping spot on the east face of a mountain in southwest Wyoming. The temperature dropped to approximately 5 degrees, according to the town's thermometers available online (I had service on my phone to be able to check). At one point when I checked, the temperature was 9 degrees with a "real feel" of -6. I believe my location was colder because of added altitude (approx. 700 feet above town where the temperature readers are. In the morning, I checked my own, cheap key-chain thermometer. It read near 0 degrees. Nonetheless, I remained cozy all night. Furthermore , wind did blow the tent wildly a number of times, which caused frost to shower onto my bag and my face, but after moving the mummy hole to the side, I would fall back to sleep into a cozy slumber. I never felt wetness.

Prior to this outing, I camped for two nights on a backpacking trip in the Big Horn Mountains where temps reached the low single digits on December 2 and 3. If you research the bag, you'll notice that it has three values written on the bag. One is the comfort temp, another is the lower limit of comfort temp, and the third is the extreme lower limit temp. Respectively, the values are approx. 12-degrees F, -1-degrees F, and -40-degrees F. I believe that the values are on the money, though I haven't tested the extreme lower limit value. Either way, in temps in the teens, this bag has been plenty warm for me. In the three times I've camped with it while temps were in the single digits, I've been more than pleased, though it has taken a little while to warm up occasionally. Also note that during the Big Horns trip I used only my inflatable pad, and I used a $30 Alpine Mountaineering sleeping bag liner. Overall, I'm excited to say I have this bag. It is my first down bag, and for the cost, I am very pleased. Also, I'm 6'6", and the long version fits me perfectly. Those taller than 6'6" would probably need to check into other bag makers. I believe some bags come in 7' or so. Either way, five stars for the Never Summer.

Spent a number of nights on snow near 0

Good Sleeping Bag

  • Familiarity: I've used it several times

I love this bag. It is super warm and cozy and lightweight. This sleeping bag can get super small too so it is perfect for backpacking. The stuff sack it came with is pretty big, so I got a 10 liter compression sack and put it in there and yank the straps real tight and this bag can get pretty small. Then you pull it out and it plushes back up to a big size it very cozy.

Good value & high quality, but bulky

  • Familiarity: I returned this product before using it

Disclaimer- I did not use this bag. I ordered it because the value seemed excellent and because another reviewer who was about my size said it fit great.

Well, I can confirm that it seems like a very warm, well-made bag, but it is way too big for someone my size (5'6", 130lbs). Certainly, the amount of room I had would have caused me to be colder than I would in a well-fitting bag. Also, the stuff sack provided is quite large and the bag doesn't compress as well as I would like. I packed it up and put it in my 55L Gregory pack and I could not get it to lie flat in the bottom- it needed to stand up. It just took up a ton of room in my pack (nearly twice as much as my old 20 degree EMS down bag with 750 fill).

I still think it's a good value if you're bigger than me and have enough room in your pack to accommodate it, but the combination of those two factors are causing me to return it. I've learned my lesson and will look for a woman-specific bag instead.

Works Well

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

I took the bag on a 3 day backpacking trip in the Sierras last weekend. The temperatures dropped into the 20s (F). The bag worked perfectly for that temperature. I combined it with a Thermarest pad and had no issues at all. It worked well fit into my 65liter pack easily. It would be nice if it came with a better stuff sack - one that can be cinched down.


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

I like the bag so far, I will say the stuff sack is huge so I wouldn't take this backpacking but it's good for car camping or something like that.

Cold Weather Camping in Luxury

  • Familiarity: I've put it through the wringer

I was hesitant to make the jump to down as a trail guide due to the tendencies for wear and tear, but boy am I glad I did. Marmot treats the down filling to be water resistant in case things do get a little hairy on trail. A down bag that won't clump at the first sign of moisture?? Sign me up! Not to mention it weighs just 3lbs! This is a no brainer for anyone starting to camp in some cold weather.

Seems good

    Just took this to the Colorado rockies in June, the temp got down to 22 F and i was able to sleep with the bag open! the down was comfy and I had plenty of room for my feet, no complaints here.

    Great buy

    • Familiarity: I've used it several times

    This is a sweet bag for the price. I haven't tested it in 0 degree weather yet, so it's hard to tell how it will preform in those temperatures. However, it has kept me toasty in the mid 30's (that's saying a lot, I turn into a pop sickle at night). It packs down small *enough* for backpacking if you have a solid compression sack, but there are definitely smaller bags out there at a higher price point. Overall I'm super stoked on this bag and would recommend it.

    Amazing , especially for the price

    • Familiarity: I've used it several times

    I've been wanting to splurge on a down winter bag for years. Luckily, this wasn't even much of a splurge. It's so comfortable I take it on warmer trips and lay on top of it. I bought a separate stuff sack, which allows it to be compressed smaller than the one included. The coldest I have used it in is about 20 F. The first night, I was rather cold. The second night, I put a hot water bottle in the bottom of the bag and was warm from the get go. If you don't do that, it takes a while for your body heat to warm up the bag. The bottom is very roomy so you can store your boots, slippers, and fuel. I am 5'10" and had just enough room for items in the bottom with the long sleeping bag.

    Great Bag

    • Familiarity: I've used it several times

    Had this bag up at Garibaldi Lake, just south of Whistler, May 4th. It got down to just below 30 degrees at about 4900 ft elevation. Our tent was on 7 feet of snow pack. I was in a T shirt, thermal bottoms and light weight wool socks and slept great. 5'8" 180, Regular.


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

    I used this sleeping bag while car camping where temps dipped down to 30-35 degrees at night and the bag kept me toasty warm all night. The inside of the sleeping bag is very soft and comfortable and the zippers were very easy to zip up and down. I would recommend this bag to anyone especially for the quality and price of the bag.


    • Familiarity: I've used it several times

    I got this bag and used it on a backpacking trip to Capitol reef, I woke up with snow on the bag and felt like i was in Bali inside. packs nice, not bad weight, good fit!

    Warning: its hard to wake up in the morn

    • Familiarity: I've put it through the wringer

    So comfortable and warm. Its rated for 0 degrees, so only use this bag in fall and winter obviously. If you're going to be camping in very cold regions, get a bag rated for -15 or lower if you run cold... On super cold nights I freeze my ass off in this bag. Other than that, I love the color and the material. Its very durable and lightweight, compact-able. Yeah.

    Warm sleeping bag with reasonable weight

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

    very comfortable and warm bag especially at this weight and price point. Kept me comfortable in the teens (farenheit) with no additional liner necessary. Construction quality seems good but haven't used it long enough to comment on durability yet.

    Nice and toasty.

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

    For as big and warm as this thing is I was surprised at how packable it was. I got to use it a couple times this fall and was very pleased with it's performance. I got the extra long one, I'm 6', and more than enough room. It was around 30° so I didn't get near the bags rating limit but from what I can tell the bag is solid.


    • Familiarity: I've put it through the wringer

    Used: in Maine on the AT for 1 month. Shenandoahs on the AT for another cold week.

    Size: I'm 5ft6in, and 130lbs. I originally bought the bag in the long version, but then exchanged it for the regular. Much better for me, the feet are actually in the foot box. It is a little tight around the shoulders IF you wanted to stretch. I tend to stay compact so it was perfect.

    TEMPERATURE: Very cozy and warm. I spent 1 week in the Shenandoahs and the temperatures were close to 0Celsius (32F) at night. I was eager to get into the bag at night. I still had my first layer on and I was very cozy and slept well. The oustide was a little humid in the morning, but dried quickly and actually never made it to the inside anyways. The fluffy-ness of the down makes it cushiony, so very comfy.

    USE: I toss and turn a lot. The bag turned with me, yet compared to another bag I have, I never feel the zippers on this one, even if completely on it at night. The strings to pull the bag around your face is ok. There's only 1, but the top string is different than the bottom string. I found it a bit annoying to pull one vs. the other, as they go through the same clip. With practice, it'll be ok.

    side note: it has that distinct chemical smell for a brand new product. It still has the smell. I like the smell but it could annoy some.

    All in all, I love it!

    ps: I do agree the little bag it comes with is useless. Buy your own compression bag, or just shuv it in the bag and compress with the rest on top! haha

    Great bag, but Regular is too small

    • Familiarity: I've used it several times

    The bag is great for what you pay for it. I sweated my butt off in long johns and a t-shirt on 20 degree nights. Based on that it should keep me comfortable if I'm wearing all my layers when the temps dip into the single digits.

    Here's why I didn't give it 5 stars:
    1. The stuff sack it comes with is useless. Buy a real compression sack because the bag has a mind of its own and really prefers to take up as much space as it can. I tried putting it in the flimsy little stuff sack it came with and within thirty seconds it had popped out and was spread out across my floor.
    2. I do NOT fit in the regular bag. I'm 5'10 and 160 pounds, pretty slim guy, most of the weight is scrawny muscle. But I am too long for the bag. If I push my feet hard against the bottom of the bag, my girlfriend can work the hood over my head, but I feel like super trapped. It's also nearly skin tight around my thighs. I can't spread my legs more than a couple inches. I get the phrase mummy bag means something, but this is one heck of a tight bag (or maybe I'm just claustrophobic).

    Pros: toasty, light enough for the price, compresses well (with a real compression sack)
    Cons: runs small, the fabric doesn't feel super strong.