Updated:
Jan 18, 2025Warmth
Weight & Packability
Comfort
Durability
Weather Resistance
Sustainability
Weight
10.2 oz.
Insulation
3.2 oz. of 850-fill down
Fabric
15D nylon
Packable
Yes (stuff sack)
Pros
Cons
Arc'teryx Cerium Hoody
For this season's top puffies, see our guide to the Best Down Jackets.
The Arc'teryx Cerium Hoody is stuffed with 3.2 ounces of 850-fill down and features Arc’teryx’s 100- and 80-gram Coreloft synthetic insulation in sweat- and moisture-prone areas such as the cuffs, underarms, and collar. Even as someone who tends to run cold, I found that the jacket kept me sufficiently warm on a month-long trip to Norway’s Lofoten Islands, during which the temperatures consistently dipped into the low 40s Fahrenheit and were accompanied by wind and rain. I usually layered the Cerium over a thin wool base layer and a midweight fleece, and it provided plenty of insulation for taking breaks on exposed peaks or passes. In blustery conditions, it also kept the wind at bay, eliminating the need to layer my rain jacket on top.
Compared to Patagonia’s Down Sweater, which features 4 ounces of 800-fill down in the women’s version (5 oz. in the men’s) and no synthetic insulation, the Cerium felt just as warm while offering better wind resistance. We wouldn’t go so far as to recommend it for exposed belays in frigid temperatures (we’d instead reach for a warmer and more weather-protective jacket like the Rab Neutrino Pro), but the Arc'teryx Cerium Hoody is a great standalone piece for shoulder-season conditions or as part of a cold-weather layering system.
At just 10.2 ounces for a women’s small, the minimalist Cerium is impressively lofty for its weight. It comes with an attached stuff sack and packs down slightly shorter—yet wider—than a one-ounce Nalgene bottle. While even lighter down jackets exist (the Mountain Hardwear Ghost Whisperer Hoody weighs only 8.5 ounces for a women’s small), the Cerium is in a class of its own in terms of balancing weight, warmth, and features (the aforementioned Ghost Whisperer has thin 10D fabric and less insulation). Overall, the Cerium is the perfect companion for backcountry trips where you need substantial warmth in a streamlined package.
The Cerium’s liner is soft on the skin, and the jacket offers the coziness I expect from a down puffy. If I had to reach for a comparison, I’d admit that it has a slightly more plasticky feel than a design like the Patagonia Down Sweater Hoody, although not enough to bother me at all. The Cerium’s fit is a bit slimmer than I’m used to, but it lends itself well to both outdoor activities and everyday wear: The jacket offers great range of movement, and the cut makes it easy to layer a base layer or thin fleece jacket underneath. The collar, when fully zipped, is cozy thanks to a fabric fold that the zipper tucks into, and the Cerium’s overall lightweight build makes it easy to wear in a variety of settings.
While the Cerium’s 15-denier nylon face fabric is thinner than many of its direct competitors—20-denier seems to be the sweet spot for lightweight down jackets—it held up well throughout my month-long trip in Norway. The zippers and hem are sturdy, and the reverse-coil front zipper (which hides the teeth on the inside) increases durability by exposing less of the zipper to the elements—and it looks snazzy, too. Granted, you can save some money with the Patagonia Down Sweater Hoody ($329), which has more durable 20D fabric, but you sacrifice packability and a lighter weight. So though the Cerium’s $400 price tag can be hard to stomach, it’s hard to find a better balance of weight and durability.
As expected, we encountered a lot of wet weather in Lofoten, which often came down as light sprinkles or mist. If I limited my exposure to less than an hour, the Cerium’s durable water-repellent (DWR) finish effectively beaded moisture and kept it from soaking through the shell fabric. Synthetic insulation in areas like the cuffs and collar provides a second line of defense (unlike down, synthetic fill continues to provide warmth even when wet), but this too will get overwhelmed during prolonged exposures or in truly wet weather. It’s worth noting that the Cerium does not include hydrophobic down, unlike some of the competition (including the Outdoor Research Helium Down). All told, the Arc'teryx Cerium’s weather resistance is above average for a down jacket, but it should by no means be relied upon in any sort of rain—heavy or light. We always recommend packing a waterproof shell when moisture is in the forecast.
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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.
Hood
The Arc'teryx Cerium Hoody has a roomy, helmet-compatible hood that features a simple adjustment cinch at the back. Even without a helmet, this allowed for a snug fit around the head that didn’t restrict my field of vision. And when temperatures dipped, the hood easily accommodated my thick wool beanie and midlayer hood without feeling overly restrictive. Like the rest of the Cerium’s design, the hood is a well-thought-out feature.
Storage
The Cerium Hoody has two hand pockets and an internal chest pocket, all zippered for secure storage. The hand pockets aren’t too large or too small and can hold essentials like a phone, snacks, a beanie, and sunglasses. The internal chest pocket is smaller than average: The zipper opening is 5.5 inches, and the pocket is about 8 by 6 inches, but it still fits an iPhone 14. All the zippers operate smoothly, and the pulls have a rubber coating that is easy to grip even with gloves on.
Tester: 5’3” 103 lb.; 32" chest; 26.5" waist
Size tested: Women’s extra small
I typically wear a women’s size extra small or small depending on the brand, and the extra-small Arc’teryx Cerium Hoody fit me perfectly. The jacket’s slim cut allowed it to rest snugly across my back and shoulders, but didn’t significantly restrict movement. (The design doesn’t offer as wide a range of motion as a loose, boxy cut, but this is as expected for a trim jacket.) The back hem reaches nearly to the bottom of the pockets on the back of my pants, providing nice coverage without being too long, while the arm length rests just above the first thumb joint when my arms are relaxed at my side. As a midlayer, the Cerium functions well under a shell without looking too Michelin Man-like or adding unnecessary bulk. A size small would have worked for me too, but the fit would be roomier and the sleeves might have been too long.
Rab Mythic G ($525): New-Age Warmth
The Cerium has long been the gold standard for warmth-to-weight ratio among minimalist down jackets, but there’s a new kid in town: the Rab Mythic G. The Mythic G checks in at just 8.9 ounces for the women’s medium—more than an ounce less than the women’s small Cerium—and packs in a hefty 4 ounces of 1,000-fill down. It also features a reflective liner that boosts heat retention. It’s all function here—a shiny lining, a 7-denier shell (noticeably thinner than the Cerium’s 15D material), and minimal adjustments—but it’s worth it for those looking to maximize warmth while keeping their kit at a low weight. However, the Mythic G is $125 more than the Cerium and includes neither hydrophobic down nor synthetic insulation in high-exposure areas, making it more vulnerable to wetting out in moist conditions. For more, read our review of the Rab Mythic G.
Himali Accelerator ($330): Save Some Cash With a Lesser-Known Brand
Himali doesn’t have the same brand cachet as Arc’teryx, but the Colorado-based company knows how to make a lightweight down jacket. For $70 less than the Cerium, the Accelerator has roughly the same amount of down fill and also employs synthetic insulation in exposed areas such as the hood and shoulders. What’s more, its down is treated with a water-repellent finish for even more protection against moisture, and it packs into its own pocket. The Accelerator does add some weight with its thicker (20D) shell, putting it at 11 ounces compared to the Cerium’s 10.2 ounces. But that’s mostly splitting hairs; if you’re willing to take the leap to a new brand, the Accelerator offers similar or better performance and a much better value. To learn more, check out our Accelerator review.
The Cerium offers extremely lightweight and packable warmth for technical pursuits like alpine climbing and backcountry skiing. Its streamlined fit is ideal for layering, too. However, given the price point, thin fabrics, and trim fit, we don’t recommend this jacket for everyday use.
Warmth
Weight & Packability
Comfort
Durability
Weather Resistance
Sustainability
Hold up, what!? We can’t believe Rab managed to pack this much warmth into such a lightweight jacket. You’ll pay a pretty penny for it, and it's unsurprisingly fragile. But the Mythic G is the only sub-10-ounce jacket we know of that can handle freezing temperatures.
Warmth
Weight & Packability
Comfort
Durability
Weather Resistance
Sustainability
The Himali is a lower-cost alternative to the Arc’teryx Cerium from a niche mountaineering brand. It offers efficient warmth for the weight and added moisture protection thanks to hydrophobic down, a DWR finish on the shell, and synthetic insulation at the collar and under the arms.
Warmth
Weight & Packability
Comfort
Durability
Weather Resistance
Sustainability
The Arc'teryx Cerium Hoody is a stellar choice for folks who are seeking a lightweight, warm, and versatile down jacket. Its balance of comfort, low bulk, and decent weather resistance makes it suitable for a wide range of activities, from hiking and skiing to around-town wear. While the Cerium’s thinner-than-average outer fabric might offer less durability in the long run, the jacket’s standout weight-to-warmth ratio makes it a worthwhile investment. This is a performance-focused down jacket that earns its price tag.
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