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Marmot Never Summer 0 Review

A great first four-season bag that weighs a little more but costs a bit less than most
Marmot Never Summer 0
Credit: Marmot
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Price:  $299 List | Check Price at REI
Compare prices at 2 resellers
Pros:  Dual zipper for venting and sitting up, zippered stash pocket, affordable
Cons:  Heavy, small draft tube allows cold air infiltration, static drawcord over the face
Manufacturer:   Marmot
By Ryan Baker ⋅ Review Editor  ⋅  Dec 17, 2021
Our Editors independently research, test, and rate the best products. We only make money if you purchase a product through our links, and we never accept free products from manufacturers. Learn more
59
OVERALL
SCORE


RANKED
#11 of 13
  • Warmth - 20% 6.0
  • Weight - 20% 6.0
  • Comfort - 20% 6.0
  • Packed Size - 15% 5.0
  • Weather Resistance - 15% 6.0
  • Features - 10% 6.0

Our Verdict

The Never Summer is warm and comfortable despite being a bit heavy. The draft tube doesn't seal the cold air out as well as other bags in its class, but it sports some great extra features our testers like. The off-side quarter zipper makes sitting up in the tent a pleasure and allows for adjustable venting on warmer nights. The loft of the down and sewn baffles keep the filler evenly spread instead of clumping in certain areas, too. For those looking to get into cold weather camping but don't want to spend heaps of cash, this is a good bargain option (though not quite our favorite).

Product Updates

Since our last test period, Marmot has updated the Never Summer, as shown in the lead photo above. The newer version has an updated color scheme and features a foot box zipper to provide extra foot space if needed.

April 2022

Compare to Similar Products

 
Marmot Never Summer 0
Awards  Editors' Choice Award Best Buy Award   
Price Check Price at REI
Compare at 2 sellers
Check Price at REI
Compare at 2 sellers
$315 List
$315.00 at REI
$325 List
$324.95 at Backcountry
$209.96 at Amazon
Compare at 3 sellers
Overall Score Sort Icon
59
73
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42
Star Rating
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Pros Dual zipper for venting and sitting up, zippered stash pocket, affordableOne of the warmest bags in the test, lightweight, compression sack includedDWR shell fabric, glow in the dark zipper, large draft tube, inexpensiveWeather resistant, comfortable, inexpensiveWarm, inexpensive
Cons Heavy, small draft tube allows cold air infiltration, static drawcord over the faceLack of hydrophobic down, missing top hood cinch, snug fit not everyone's favoriteHeavy, static drawstring around the faceHeavy, zipper snagsHeavy, large packed size, not very weather resistant
Bottom Line A great first four-season bag that weighs a little more but costs a bit less than mostA truly supreme sleeping bag that stands out for impressive weight savings without missing out on warmthAn inexpensive bag that offers excellent warmth and weather resistance, albeit heavier than most in our fleetThis bag is heavy on the warmth and light on the walletAn inexpensive option that will keep you warm, but too bulky and heavy for heading more than a few miles into the backcountry
Rating Categories Marmot Never Summer 0 Mountain Hardwear P... Mountain Hardwear B... Rab Ascent 900 Kelty Cosmic 0
Warmth (20%)
6.0
8.0
7.0
5.0
6.0
Weight (20%)
6.0
8.0
6.0
5.0
2.0
Comfort (20%)
6.0
6.0
6.0
6.0
6.0
Packed Size (15%)
5.0
8.0
5.0
4.0
2.0
Weather Resistance (15%)
6.0
6.0
7.0
6.0
3.0
Features (10%)
6.0
8.0
6.0
8.0
6.0
Specs Marmot Never Summer 0 Mountain Hardwear P... Mountain Hardwear B... Rab Ascent 900 Kelty Cosmic 0
Measured Weight (lbs, size Regular) 3.19 lbs 2.68 lbs 3.13 lbs 3.29 lbs 4.56 lbs
Fill Weight (oz) 36.2 oz 29.6 oz 35 oz 31.7 oz 39.5 oz
Type of Down Fill Down Goose Down RDS Cert/Fluorine Free Down European Goose Down Duck Down
Fill Power 650 850 650 650 550
Material Weight (excludes down, oz) 14.9 oz 13.28 oz 15.1 oz 20.98 oz 39.5 oz
Temperature Rating 0°F 0°F 0°F 0°F 0°F
Pocket Yes Yes Yes Yes Yes
Shoulder Girth (inches) 62" 58" 62" 59" 62"
Hip Girth (inches) 57" 52" 53" 51" 58"
Foot Girth (inches) 48.5" Not listed Not listed 49" Not listed
Shell Material 20-denier ripstop nylon 10D nylon Ghost ripstop, DWR finish 20-denier ripstop nylon Pertex Microlite 20D Nylon
Continuous Baffle Yes No Yes Yes Yes

Our Analysis and Test Results

This is a great first winter bag or a step-up replacement from that old cotton-filled bed roll your grandpa left you. Our testers stayed warm and dry on multiple early winter outings and adventures. A few extra features and evenly spread, plush down fill make this a good bag for the price and a little extra weight. An extra zipper makes sitting up easy and keeps your legs warm while you hang out in camp. The ripstop shell held up well during months of testing and the down kept its loft. This model is great for car camping or short winter missions in the backcountry.

Performance Comparison


Marmot Never Summer 0 sleeping bag down cold weather - the extra zipper on the opposite side makes sitting up easier...
The extra zipper on the opposite side makes sitting up easier without needing to fully unzip the dominant zipper.
Credit: Matt Bento

Warmth


The Never Summer is stacked with 36.2 ounces of 650 fill down and tricot stretch baffles to prevent the bunching of the material. After nights of tossing and turning to try to shake and clump the down, we were unable to decrease the loft and dispersion of the fill. The bag does feature a draft tube and even an accessory zipper on the opposite side of the full-length zipper to allow for ventilation. The baffled hood draws snugly over your head and the collar baffle keeps the warm air in the bag if you are shifting positions. The full-length two-way zipper allows for further venting at your feet if you get too hot.

Marmot Never Summer 0 sleeping bag down cold weather - the hood is cozy but started to max out and feel tight on the top of...
The hood is cozy but started to max out and feel tight on the top of the head and forehead right at six feet in size Regular.
Credit: Matt Bento

There isn’t a lot of room in this mummy bag to wiggle around which means there is less dead air space to heat up. Unfortunately, our testers found the zipper baffle insufficient to keep all the drafty cold air out when sleeping outside the tent. This wasn’t as much of an issue in the cozy abode of our tent but worrisome all the same. The loft fell in the middle of our lineup for plushness but was evenly spread throughout the bag. The hood closes over your face and keeps a naked head fairly warm though we would have preferred a bungee style drawstring to the thin static cord to allow some play when shifting positions.

Weight


The Never Summer is on the heavier end of our line up weighing in at three pounds and three ounces. This bag is better suited for short hikes, ski tours, or car camping. Those that aren’t shy to carry extra ounces to save money won’t bat an eye. Still, this is a very competitive weight for its class and price point. Extra zippers and materials do add up in weight and 20 denier fabric can help protect a fragile down bag if you are forgoing the tent to save weight on an excursion.

Marmot Never Summer 0 sleeping bag down cold weather - over 36 ounces of duck down fill provided adequate warmth but wasn't...
Over 36 ounces of duck down fill provided adequate warmth but wasn't as lofty as other bags we tested.
Credit: Matt Bento

Comfort


A lot of comfort preference depends on what type of sleeper you are. Side sleepers or spreaders may feel a bit confined in the tight mummy shape. It features 57 inches in the hips which is snug but not uncomfortable for our larger testers. The weight savings are monumental and the added warmth of this design is equally important. For back sleepers and stomach sleepers, this shape is not an issue. We tested side sleeping and drawing our legs as well. While it is a snug bag, it did not limit movement in six-foot, two hundred-pound testers in the regular size. The hood is tight compared to other models but this was only for those at the upper height limit of the size. If you settle on this bag, consider sizing up for extra room to stretch out.

Marmot Never Summer 0 sleeping bag down cold weather - the 20 denier ripstop shell is soft and supple and didn't feel...
The 20 denier ripstop shell is soft and supple and didn't feel abrasive.
Credit: Matt Bento

Packed Size


For being slightly over three pounds and a zero degree bag, the Never Summer compresses as small as other competitors in its class. We tested each bag by stuffing it into a Sea to Summit 20L compression sack and were able to cinch the drawcords all the way down.

Marmot Never Summer 0 sleeping bag down cold weather - the 650 fill is packed easily and a 20-liter sack is compressed all...
The 650 fill is packed easily and a 20-liter sack is compressed all the way down.
Credit: Ryann Baker


Unfortunately, the bag does not come with a compression sack which we would have liked but simply comes with a stuff sack. It is important to remember that the 650 fill down is more susceptible to damage after continually being compressed; so, if you like to squeeze your bag into the size of a tuna can, consider upgrading to a higher fill rating.

Features


The Never Summer features a full-length draft tube and neck or draft collar to keep warm air in and cold air out. The zipper is lined with a tougher durable material to prevent snagging but is only one inch wide. Our testers found that the softer liner material was still able to fold around this and get caught in the zipper. The anti-snag slider did help a little, too, but holds the teeth at a more obtuse angle and decreases the ease of drawing the zipper without holding the distal end taught.

Marmot Never Summer 0 sleeping bag down cold weather - the accessory zipper on the off-side allows multiple venting options...
The accessory zipper on the off-side allows multiple venting options and comfort positions.
Credit: Matt Bento

The zippered stash pocket is big enough for a phone, knife, or headlamp. If you're forceful, maybe all three together. The zipper has a little fabric cover so it doesn’t rub on you if the pocket is empty. We appreciated that the zipper guard is orange against a backdrop of gray material to make locating the zipper super easy in a hurry.

The accessory zipper on the opposite side of the full length (we tested a left zipper so it was on the right) is a welcome feature. This short zipper allows for ventilation or our preferred use was sitting up with a hot drink and enjoying symmetrical coverage. Not necessary but fun and unique.

Marmot Never Summer 0 sleeping bag down cold weather - the zipper pocket is about the size of an average smartphone, with a...
The zipper pocket is about the size of an average smartphone, with a bright zipper guard to help it stand out.
Credit: Matt Bento

Weather Resistance


In light rain and submersion testing, the 20 denier ripstop held up reasonably well. The shell material is treated with Down Defender which performs nearly as well as DWR treatments on other similar products we tested. We allowed the water to pool up on the surface and only after ten minutes did the material begin to show signs of saturation. The zipper is much more susceptible to soaking and leaking in a deluge.

Marmot Never Summer 0 sleeping bag down cold weather - the treated ripstop material held up for nearly ten minutes with...
The treated ripstop material held up for nearly ten minutes with pools of water before the material started to saturate.
Credit: Matt Bento

Value


This product offers pretty good value. While it’s not a steal, it’s certainly a fair grab for the price. It scored slightly lower in some key metrics such as warmth due to the narrower draft tube but overall it is an impressive product for the price. This bag performs well at its stated rating and withheld months of use and abuse, in and out of the tent.

Conclusion


This bag lands in the middle of the road for our testing categories. Not the cheapest bag but made with sturdy materials and quality construction. Our testers found bags that scored higher but for higher cost and a few that scored marginally better at a competitive price comparatively. We like the extra zipper for comfort while sitting, so if you plan to hang out and write or read in a tent for days waiting out a storm for the perfect weather window, this may be the perfect bag for you.

Marmot Never Summer 0 sleeping bag down cold weather - a roomy foot box allowed space for batteries or bottles of warm...
A roomy foot box allowed space for batteries or bottles of warm water on the coldest nights.
Credit: Matt Bento

Ryan Baker
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