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The NEMO Kayu 15 Sleeping Bag is an ultralight mummy bag designed for 3-season adventures. Thanks to a tapered mummy cut, this bag maximizes thermal efficiency while minimizing packed size, and the lofty 800-fill down is treated with Nikwax™ for enhanced moisture-resistance and quicker drying times. Zippered Thermo Gills™ on top vent excess body heat while preventing cold drafts from sneaking in.
Products on Sale are Discontinued Styles or Colors.
Premium 800 FP down is ultra-packable, hydrophobic, PFC-free, and 100% Responsible Down Standard (RDS) Certified for traceability throughout the supply chain
Thermo Gills allow you to vent body heat without letting cold drafts in
Waterproof and breathable footbox and hood protect against tent wall condensation
Tailored patterning is designed for optimal thermal efficiency and packability
Premium down insulation is treated with Nikwax for waterproof security on the trail
Body-mapped tapered core is designed for an ideal fit with no wasted space
Full-length YKK zipper with snagless baffle construction and draft tube seals warm air in
Responsible Down Standard
Bag Weight (Regular):
Bag Weight (Long):
Packed Dimensions (Regular):
14.5 x 8 in.
Packed Dimensions (Long):
14.5 x 8 in.
Sleeping Bag Shell:
20D Nylon Ripstop with DWR
Sleeping Bag Lining:
30D Nylon Taffeta w/ DWR
Fill Weight (Regular):
Fill Weight (Long):
Max User Height (Long):
Foot Circumference (Regular):
Foot Circumference (Long):
Shoulder Circumference (Regular):
Hip Circumference (Regular):
Shoulder Circumference (Long):
Hip Circumference (Long):
Winter Camping, Mountaineering and Alpine, Camping
11 - 20 Degrees Fahrenheit
Exact Temperature Rating:
15 Degrees Fahrenheit
Sleeping Bag Shape:
Max User Height (Regular):
800 Fill Power Down
Rated 3 out of
Not happy with the KayuI have used the Kayu 15F degree bag for 12 nights in temperatures from 25F to 45F. Only when the temps were around 40F-ish was I warm. Below the the 40's, I had to put on many clothing layers to stay warm.
Shouldn't the comfort rating (which Nemo does not list for the Kayu) be much lower than around 40F for this bag?
I know we all sleep warmer and colder at different temps, but to have to be around 40F and above to be comfortable in this 15F rated bag, something seems wrong.
My bag also leaks feathers, very very few though. Not sure if this is normal.
Props for the waterproof foot box which came in handy and the nice, large, storage sack for long term storage that was included.
Date published: 2020-05-21
Rated 2 out of
chilly bear from
Didn't keep me warm :([This review was collected as part of a promotion.] I am scratching my head...did they mean 15 C and NOT F? Got my Kayu 15 and was very excited because I am a big nemo fan. The bag is cool looking and packs VERY small and is VERY light. I was pleased with that. But at 35 F I was freezing and had to layer up. At 25 F I wore 4 heavy tops and three pairs of pants and extra heavy wool socks with handwarmers AND added a liner that was supposed to add 10F to the comfort and I barely felt comfortable... It's a bummer because I really like Nemo, but this sleeping bag just isn't going to cut it for me.
Date published: 2021-01-18
Rated 5 out of
Trail Vision from
Impressive!I've been in the market for a lightweight sleeping bag that doesn't compromise on warmth and I finally found it. The fabric is top shelf and feels great against your skin. The bag is quite slim and is almost "form fitting"(Which I like). I wouldn't recommend using this bag below 15° without a liner or additional insulation. Anything above that you'll be good to go. This is a truly a great sleeping bag.
Date published: 2019-02-25
Rated 5 out of
Top Notch BagI have used this bag this past month on the start of my thru hike on the PCT. Absolutely love it. Compatible and light weight. Zipper can be a tad touchy sometimes but once you get the hang of using it it’s not an issue. No cold spots and I absolutely love the gills for warmer nights. I can’t wait to take this thing all the way with me!
Date published: 2019-04-26
Rated 5 out of
Keeps you WARMThis sleeping bag weighs next to nothing; is incredibly packable; is so nice to crawl into at night and get real toasty real quick; is extremely quiet when sleeping; it even allows for side sleeping and belly sleeping! First "real" sleeping bag to purchase and I am absolutely stoked on it! I've used it many times in Desolation wilderness ranging from 20 degrees at night to 30 and I've slept soundly and warmly every night in that bag. Going to upgrade pad soon to the alpine tensor and will be taking this to Whitney.
Date published: 2019-10-16
Rated 5 out of
More comfortable than my own bed!NEMO's first priority is sleep quality, and you get it all in the Kayu. The 800FP down makes it ultralight and amazingly comfortable at the same time. The mummy shape is just wide enough to be able to sleep on the side. The thermo gills are a unique and awesome feature from NEMO, and it shouldn't be taken for granted. I have used this one from -15°C at night to almost 25°C because of them. This is the kind of gear that makes you VERY proud to use in the backcountry!
Date published: 2019-10-20
Rated 2 out of
Not What I Was ExpectingI have backpacked for a long time professionally and recreationally. I have always used Marmot or Feathered Friends sleeping bags, I figured why not give Nemo a shot since their Dagger tents are amazing. At first the weight and packing size of these bags amazed me, but the 15° rating feel short. My partner has the Aya and I have the Kayu, how can both bags fall short of their temperature ratings? I am a very warm sleeper and had to wear wool base layers and a down vest to be able to sleep during 40° nights. What I am particularly shocked by is the number of feathers I found in my tent on our first trip out with the bags. Which led to an explanation for the lack of insulation, it's the severe lack of quality in the feather clusters used to fill the bags which was shocking for the price of the product. We had a good laugh at the time that it was snowing feathers in my tent. But in the end, I feel a bag at this price level shouldn't fail on so many critical areas. Not just my bag but my partners bag as well.
Date published: 2020-04-27
Rated 3 out of
Light and Packable but with a CostI needed a bag that packed down small for my alpine climbing adventures and guiding in the Cascades and China. I found the Kayu 15º fit that bill.
I was surprised how little fill it had when I pulled it out of the package, and I first initially assumed it was due to the nature of the bag's use of the 800-fill down. However, on one of my early test trips, I brought the bag out to the Alpine Lakes Wilderness in the Central Cascades in June. Temperature probably dropped to around freezing in the middle of the night, and I could already feel the cold air coming inside the bag, especially since this bag saves on bulk by eliminating a draft tube next to the zipper. I had to layer up to sleep comfortably. Since then, I have been using the OR Helium Emergency Bivy Sack to add a little more to the temperature rating. While I have yet to try it in truly frigid conditions, I would think this is more of a 3-season bag, rather than a true, cold-weather 15º bag (more like 30º or higher?).
Verdict: If you want a bag that excels at packability and provides you with enough warmth for all your summer alpine adventure needs, go with this bag. If you are looking for something with more guarantees to keep you warm as the temperatures get towards freezing, look for a bag with a bit more bulk.
NB: I have also noticed some of the down sneaking out here and there from the bag, which I have had for just this year, 2020. While not as bad as the leaks experienced by the previous reviewer, it is something I noticed. We will see if the problem persists through this season, since I am using it fairly regularly.