Nemo Riff Endless Promise 15 Sleeping Bag Review
Like most Nemo products, the Riff ($400) showcases excellent craftsmanship and thoughtful design details. As the brand’s top-tier sleeping bag, it features premium materials—800-fill power down and soft, high-quality fabrics—along with comfort-enhancing extras. However, despite its cozy feel, the Riff falls into an awkward middle ground. At over two and a half pounds (and more than 3 lb. for the women’s version), it’s too heavy for most backpackers, yet there are roomier and more affordable options better suited for car camping. While undeniably well-made, the Riff struggles to carve out a clear niche.
Warmth / Weight
Comfort
Features
Durability
Water Resistance
Sustainability
Temp Rating
18/5˚F (ISO Comfort/Limit)
Weight
3 lb. 6 oz.
Fill
1 lb. 14 oz. of 800-fill down
Shell
Polyester
Shoulder/Hip Girth
60/54 in.
Packed Volume
10.8L
Other Temps
30F
Pros
Cons
Nemo Riff 15
For this season's top models, see our guide to the Best Backpacking Sleeping Bags.
Despite the “15” in its name, the men’s Riff has a comfort rating of 28 degrees and a limit of 17 degrees. I tested the women’s version—warmer to account for women generally being colder sleepers—with a comfort rating of 18 degrees and a limit of 5 degrees. The women’s bag packs in an incredible 1 pound 14 ounces worth of down—among the highest quantities of down we’ve seen in a 15-degree bag. As a result, the Riff falls within a versatile temperature range for three-season camping; in my experience, there’s no reason to doubt its temp rating. I run so cold that I usually camp with a 0-degree bag year-round, and the Riff kept me cozy and warm while sleeping in the Lofoten Island high country. Heck, on a particularly mild night, I even had to sleep with the bag’s two vents open to dump heat.
A warm sleeping bag is great, of course, but the Nemo Riff 15 is simply too heavy for most backpacking trips. It weighs 2 pounds 10 ounces for the men’s version and over 3 pounds (!) for the women’s, specs that would bar it from the kit of many a backpacker—including mine. This bag has a ton of features (I’ll get to those in another section) that help increase its coziness, but they also add bulk. When I scrunched the Riff into its included compression sack, I found that it compressed down to about the size of a large watermelon—certainly not low-profile enough for a minimalist-minded hiker, and probably too large for even moderate backpacking trips. I think the Riff’s weight and bulk is a fair trade for its plushness, but don’t fall into the trap of thinking this bag is made for deep wilderness treks.
There are plenty of lighter three-season backpacking sleeping bags out there, including the Sea to Summit Spark 15 (1 lb. 9.7 oz., with a 15°F lower limit) and the Therm-a-Rest Parsec 20 (1 lb. 13 oz., with a 18°F lower limit). If you’re trying to find a balance of weight and comfort on your hike, the Riff might not be the best option. But for folks who don’t mind the weight or have more car camping trips in mind, this bag will keep you plenty toasty.
Comfort is the product of both space and materials, and the Nemo Riff 15 posts above-average scores in both metrics. I found the Riff’s hourglass shape (it’s slim through the waist and bells outwards at the shoulders and knees) plenty roomy, and I liked having the extra space in the elbows and knees as I often flop from side to side when I sleep. I never felt constricted in the Riff, yet I also liked that there wasn’t too much space, which would compromise warmth.
However, for such a heavy sleeping bag the Nemo Riff 15 is actually less roomy in some areas than the (much lighter) competition. The Therm-a-Rest Parsec 20, for example, measures 62 inches around the shoulders and 57 inches at the hips, compared to the Riff’s 60-inch shoulder and 53-inch hip girths. The Spark, meanwhile, checks in at 61 inches around the shoulders and 53 at the hips. Both of those bags weigh around a pound less than the Riff—unless you’re a side sleeper who wants extended knee room, they might be better picks for both cutting ounces and maximizing space. And, if spaciousness is your main goal, the Nemo Disco 15 has an even more generous hourglass shape that measures 62 inches at the shoulders, 57 at the hips, and 61 at the knees. The Disco, which accommodates pretty much any sleep position, is only marginally heavier than the Riff.
Thankfully, the Riff’s construction helps make up for its comparatively “meh” dimensions. Its polyester fabric has a soft, pleasant feel, and I enjoyed the oversized draft collar that ups the plush factor and blocks cold air from rushing inside. The pound-plus of lofty 800-fill down also makes for a cloudlike sensation once you’re in the bag. I don’t think you’ll regret bedding down in the Riff, but there are more spacious, feature-filled options for the weight.
The Riff is a feature-rich sleeping bag for backpacking. Perhaps its most noticeable design elements are two zippered vents on either side of the torso. Each vent has an internal and external zipper so you can operate it without taking your arms out of the bag, and the vents are covered with a thin layer of fabric so you can shed heat without being too exposed. As I mentioned earlier, the oversized draft collar—which looks and functions more like a puffy neck blanket—is a wonderful add-on and increases the sensation of sleeping in a cozy cocoon. I also loved the Riff’s pillow pocket in the hood, although I did wish for a small zippered pocket for storing batteries or a phone.
My first impressions of this bag were that it was well-made and felt durable and long-lasting. The Riff’s polyester material is reinforced with thicker material at the top and bottom to guard against moisture and abrasion, and on the whole I didn’t see any areas of concern. No sleeping bag is as bomber as, say, a backpack, but you shouldn’t have to show the Riff any special treatment besides normal awareness of not using it directly on sharp rocks and the like. Overall, I think the Nemo Riff 15 provides great value for the cost.
When you're spending nights outdoors, moisture management can make or break your comfort. The Nemo Riff 15 proactively addresses damp conditions by combining water-resistant hydrophobic down insulation with strategic reinforcements. Notably, its hood and footbox—areas most likely to brush against the wet walls of a backpacking tent—feature a burlier material treated with a PFAS-free waterproof finish. This targeted waterproofing helps keep moisture from seeping into the bag's fabric at common trouble points. While these features provide reassuring protection against dampness and tent condensation, it's still advisable to use a waterproof stuff sack and keep your sleeping bag safely inside your tent when heavy moisture is anticipated.
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Longevity
Choosing durable outdoor gear and keeping it in use for longer is one of the best ways to reduce environmental impact. Our proprietary longevity rating assesses factors like overall build quality, materials, fabric denier, component durability, and real-world performance. A green check indicates that we expect the product to be long-lasting relative to its peers, a yellow check mark indicates average longevity, and a red X indicates a product that may have a limited lifespan.
Responsible Down
The Responsible Down Standard (RDS), developed by Textile Exchange, is the leading certification for responsibly sourced down and uses third-party audits throughout the supply chain to verify animal welfare, responsible farming practices, and safe working conditions. Recycled down is another responsible choice that helps reduce demand for newly sourced down while keeping existing materials in circulation. A green check mark indicates a product uses responsibly sourced or recycled down, a yellow check mark indicates the brand sources responsible or recycled down for the majority of its products but does not specify it at the product level, and a red X indicates the product does not use responsibly sourced or recycled down.
PFAS-Free DWR
Durable water-repellent (DWR) finishes can contain PFAS (per- and polyfluoroalkyl substances). These highly persistent “forever chemicals” are used in outdoor gear for their strong resistance to water, oil, and heat, but are linked to environmental contamination and a range of health concerns. A green check mark indicates the product uses a PFAS-free DWR, while a red X means the DWR contains PFAS.
Recycled Materials
Recycled materials are prevalent in outdoor gear, with nylon, polyester, wool, and down among the most common, but the composition varies widely. A green check mark indicates the product is made with a substantial amount of recycled materials (100% recycled or the core fabric that makes up most of the product is recycled), a yellow check means it contains a moderate to small amount of recycled materials, while a red X means there are no recycled materials in the product.
Bluesign Approved
Bluesign Technologies, based in Switzerland, operates a third-party textile management system that ensures materials are manufactured to strict environmental, chemical, and worker safety standards. A green check mark indicates a product is either a Bluesign Product (contains at least 90% Bluesign-approved fabrics and 20-30% Bluesign-approved accessories) or features a significant amount of Bluesign-approved materials. A yellow check mark means it uses some Bluesign-approved materials but less than the aforementioned category, and a red X means there are no Bluesign-approved materials in the product.
Responsible Manufacturing
This criterion evaluates a brand’s commitment to fair wages, safe working conditions, and reducing environmental impact through certifications and programs like Fair Trade Certified, Fair Wear Foundation, Worldwide Responsible Accredited Production (WRAP), and the Fair Labor Association, while also recognizing brands that manufacture primarily in the U.S. or Europe under strict labor and environmental regulations. A green check mark indicates a brand meets our responsible manufacturing criteria, while a red X means it does not.
Recycled and/or Reduced Packaging
Packaging can add significant waste to outdoor gear purchases, so many brands work to reduce its impact by using recycled materials, incorporating Forest Stewardship Council-certified paper products, and minimizing plastic and paper use. A green check mark indicates a brand uses recycled or reduced materials across all of its packaging, a yellow check indicates moderate or limited use of recycled or reduced packaging, and a red X indicates the brand does not make either of these efforts.
Repair Services
Repair services extend the lifespan of outdoor gear and reduce overall consumption, though programs vary widely. Some brands offer comprehensive repairs for a range of issues, while others provide limited or no repair support. A green check mark indicates a robust repair program, a yellow check mark indicates limited repair services, and a red X indicates the brand does not offer repair services.
Resale and/or Recycling Services
Resale and recycling programs help keep outdoor gear in circulation longer and out of landfills, ranging from trade-in resale platforms that offer store credit to take-back initiatives that recycle products at the end of their usable life. A green check mark indicates a brand offers both resale and recycling programs, a yellow check mark indicates it offers one or the two, and a red X indicates it offers neither.
Carbon Footprint Tracking
This criterion evaluates whether a brand measures, reports, and works to reduce its greenhouse gas emissions using established frameworks such as the Higg Index, Greenhouse Gas Protocol, or The Change Climate Project. A green check mark indicates a brand publicly reports greenhouse gas emissions data, sets clearly defined reduction targets, and uses established tracking frameworks such as Higg or The Change Climate Project. A yellow check mark indicates the brand tracks emissions and outlines reduction goals but provides limited data, lacks science-based verification, or does not clearly report progress. A red X indicates the brand does not appear to track greenhouse gas emissions or provides so little information that its efforts cannot be verified.
Annual Impact Report
Annual impact reports provide transparency and accountability by outlining a brand’s sustainability efforts across areas such as material sourcing, greenhouse gas emissions, waste, water use, supply chains, and packaging. A green check mark indicates a brand publishes a detailed, brand-specific impact report that closely aligns with our sustainability criteria and leaves little room for ambiguity. A yellow check indicates a brand provides some relevant sustainability reporting but lacks detail in key areas or is covered only briefly within a parent company report. A red X indicates a brand does not regularly publish an impact report.
The Nemo Riff 15 is available in both men’s and women’s versions, and each comes in a size regular (fits up to 6” for men and 5’6” for women) and a size long (up to 6’6” for men, 6’ for women). I’m 5-foot-3 so I tested the women’s regular, and I found the bag to be very roomy throughout. Although I had plenty of space and enjoyed that the bag didn’t have the closed-in feel of a more technical silhouette, there wasn’t so much room that the Riff’s thermal efficiency was compromised. All told, the bag does a good job of balancing space and warmth (if not weight).
Nemo Disco 15 ($300): More Comfort, Better Price
Unlike the Riff, the Disco 15 doesn’t pretend to be ultralight—and it’s better for it. By using 650-fill-power down instead of 800-fill, it shaves $100 off the price, making it a more affordable and practical choice. While the lower fill power means it’s slightly heavier and less packable, the Disco still delivers on comfort with a silky-smooth fabric and the same impressive feature set as the Riff—including a blanket-style draft collar and zippered vents. Where the Disco really shines is its roomier hourglass shape, which is 2 inches wider at the shoulders and 4 inches wider at the hips and knees compared to the Riff. This extra space makes it one of the best options for side sleepers, allowing them to fold their knees comfortably without feeling constricted. If you’re not hauling your gear deep into the backcountry, the Disco’s extra weight is a fair trade-off for superior comfort. This sleeping bag knows its priorities—and gets them right. For more, read our review of the Nemo Disco 15.
Therm-a-Rest Parsec 20 ($470): Larger and Lighter
The Parsec and Riff offer similar levels of warmth (with 29° and 28°F Comfort ratings, respectively), but they diverge in a few key ways. Most notably, the Parsec boasts a far more impressive warmth-to-weight ratio thanks to its loftier 900-fill-power down and a streamlined feature set that skips extras like an oversized draft collar and ventilation zippers. As a result, it comes in nearly a pound lighter at just 1 pound 13 ounces. It’s also roomier overall, with a generous 62-inch shoulder girth and 56-inch hip measurement (compared to the Riff’s 60/54 in.), though it tapers a bit more at the knees than the hourglass-shaped Riff. For $70 less, the Riff still makes the most sense for those looking for comfort at a reasonable weight.
REI Co-op Magma 15 ($399): More Warmth for Your Buck
Coming in $1 cheaper than the Nemo Riff is the venerable REI Magma 15, which is one of the best-selling sleeping bags on the market. These are two very different options: The Riff incorporates Nemo’s signature “spoon” shape (“Ultralight Spoon” in this case), making it a premium option for side sleepers (the popular Disco line uses 650-fill-power down that is even less backcountry-ready). However, the Magma 15 clearly offers more bang for your buck, with more down fill and higher fill-power down. The result is a noticeably warmer sleeping bag (the Magma has a 21°F comfort rating and 9°F lower limit rating, whereas the Riff is 28°F and 17°F, respectively). And if you inspect the dimensions, the Magma is just as roomy as the Riff in the shoulders and hip, while the latter expands down toward the knees. We understand the draw to Nemo’s unique sleeping bags—especially for side sleepers—but the Magma 15 is warmer and nearly as comfortable at a noticeably lower weight. For a deeper dive, read our review of the REI Co-op Magma 15.
The Riff pairs nominally weight-saving materials with a comfort-minded mentality, but the results aren’t spectacular. This bag feels great, but we wish it leaned into either its roominess or packability even more.
Warmth / Weight
Comfort
Features
Durability
Water Resistance
Sustainability
With an hourglass shape that provides plenty of room at the shoulders and knees, the Disco’s dimensions are a boon for side-sleepers. Ultra-soft materials and zippered vents add to the comfort-first design—at the expense of some extra weight.
Warmth / Weight
Comfort
Features
Durability
Water Resistance
Sustainability
A three-season bag that undercuts much of the competition on price, the Parsec offers a competitive warmth-to-weight ratio, above-average durability, and a handful of thoughtful quality-of-life features. Roomy dimensions and the lack of a short size make it a less ideal fit for smaller users.
Warmth / Weight
Comfort
Features
Durability
Water Resistance
Sustainability
Is the Riff 15 for You?
While the Nemo Riff 15 isn't a bad sleeping bag, it does fall somewhat short of expectations. Its positioning is a bit tricky—perhaps best suited for slimmer sleepers who find bags like the Disco too roomy but still prefer extra features beyond what's offered by traditional mummy bags. If you identify as a slimmer sleeper seeking that balance of space and versatility, the Riff could be an excellent fit. However, most backpackers will likely find greater satisfaction either stepping up to the roomier Disco or choosing a lighter, more streamlined option.
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