Updated:
Jan 19, 2025Warmth
Weight & Packability
Comfort
Durability
Weather Resistance
Sustainability
Weight
9.8 oz.
Insulation
4.5 oz. of 1,000-fill down
Fabric
7D nylon
Packable
Yes (stuff sack)
Pros
Cons
Rab Mythic G
For this season's top puffies, see our guide to the Best Down Jackets.
The Rab Mythic G delivers outstanding warmth given its ultra-lightweight design. The hoody is stuffed with 4.5 ounces of super high-end 1,000-fill down in a men’s medium (the down accounts for more than half of its total weight of 9.8 oz.), and also features a heat-reflective lining. I felt the warmth immediately upon putting the jacket on, and this puffy kept me warm as part of my layering system on a four-day backpacking trip in Washington’s Goat Rocks Wilderness, as well as a five-week expedition to climb 13,186-foot Mount Waddington in British Columbia, both trips where minimizing weight and bulk make everything better. I was especially glad to have the Mythic G with me during an unplanned bivy at 9,000 feet in the Washington Cascades—temps dipped to the high 30s, and while I was a bit chilly, I remained comfortable enough.
The bottom line is that the Rab Mythic G is a toasty down jacket, and I would confidently rely on it for cold-weather hiking, climbing (as a belay or emergency piece, given its low durability), and ski touring. Around camp, when I’m more stationary, I found it sufficiently warm down to the low 20s (it’s worth noting I run warmer than average). The Mythic G provides similar warmth to my heavier Rab Electron Pro (1 lb. 2.5 oz.), and more warmth than my old Patagonia Down Sweater Hoody, which weighs 14.8 ounces. At under 10 ounces, that’s truly exceptional performance.
This is where the Mythic G truly shines—it’s rare to find a down jacket this warm that’s also this light and packable. At 9.8 ounces for a men’s medium (10 oz. on my scale), the Mythic G is among the lightest puffies in the category, and thanks to the high-end, 1,000-fill-power down, it compresses down to smaller than a 1-liter Nalgene in its included stuff sack. Over the course of my testing trips, that packability was much appreciated when I didn’t need the extra warmth. The mix of warmth, lightness, and compressibility is exactly what you’d want for the backcountry, especially regions with long approaches such as the Cascades.
Even when compared to other ultralight down jackets, the Mythic G still stands out for its balance of warmth and weight. The Ghost Whisperer, although an ounce lighter than the Mythic at 8.8 ounces, provides notably less insulation (3 oz. of 800-fill down and no heat-reflective lining). It’s a similar story for the Arc’teryx Cerium Hoody, which weighs two ounces more than the Mythic, but we’ve found it only comfortable into the low 40s or upper 30s Fahrenheit, whereas the Mythic is comfortable in below-freezing temps. (That said, both competitors cost significantly less.)
I think it’s uncommon to find a lightweight down jacket that’s not comfortable, but even still, the Rab Mythic G rates highly amongst its peers in this category. The interior liner is soft despite its heat-reflecting quality and metallic look, and there’s a comfortable microfiber patch at the collar where the jacket zips over your chin. Fit-wise, the Mythic G’s regular cut is roomy and unrestrictive without seeming bulky, and it feels featherlight on my shoulders.
Unsurprisingly, since the Mythic G prioritizes lightweight warmth, its 7-denier (D) face fabric is quite thin. While most everyday down jackets fall in the 20D to 30D range—the Patagonia Down Sweater and the Stio Pinion are 20D, and even famously lightweight models such as the Mountain Hardwear Ghost Whisperer are usually 10D to 15D—I’ve had to be extra careful around sharp branches, rocks, and gear with this puffy. This is not a jacket for rugged use, but that’s the tradeoff for its minimalist appeal.
Otherwise, this jacket demonstrates long-lasting build quality in the details, with excellent stitching and smooth zippers. During 30 days of testing, a few feathers escaped the jacket, which is comparable with other puffies I’ve owned. The Mythic G’s quality matches expectations for a top-of-the-line—and top of the price sheet—puffy.
The Mythic G seals out moderate wind, but it performs poorly in rain. Despite its durable water-repellent coating (DWR), the thin face fabric wets out quickly, and the jacket will almost immediately absorb water. I wouldn’t trust this puffy in any kind of precipitation; since down loses its ability to insulate when wet, a shell will be necessary if you’re facing rain or snow. (The Mythic G’s down has a hydrophobic coating, but it doesn’t hold out for long.) On the plus side, the elastic cuffs and adjustable hem effectively block out cold drafts.
In comparison, many down jackets will at least bead water for 20 minutes in misty conditions. For instance, the Cerium Hoody’s water resistance can handle light drizzles for over an hour, and with synthetic insulation in moisture-prone areas, it also more effectively maintains warmth when damp—but those upgrades come at the expense of more weight.
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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 hood on the Mythic G is another thoughtfully designed highlight. It has a great fit with enough stretch to fit over a helmet, yet it’s not bulky or oversized without one. The hood opening features elastic at the sides, while the top and chin areas are non-elastic (the top has a wire-like brim that slightly increases coverage). Despite a lack of adjustability, this design creates a snug fit, preventing drafts from coming through. Finally, there is a fleece-lined chin guard at the top of the zipper, adding a soft next-to-skin feel.
Storage
You get two standard hand pockets on the Mythic G, each with smooth-running, concealed zippers that add to the jacket’s premium look. Each pocket provides plenty of room for a phone, lightweight gloves, or a pocket camera. Notably, in keeping with its ultralight design, the jacket lacks a chest pocket or internal drop-in pockets.
Tester: 5’8” 140 lb.; 38" chest; 28" waist
Size tested: Men’s medium
I typically wear men’s size medium down puffies, so I tested the Rab Mythic G in a medium as well and found that it fit as expected. With my body proportions—I have a long torso, wide shoulders, and short arms relative to my height—I often have issues finding jackets that are long enough without being too large in the trunk or overly long in the sleeves. I encountered these same issues with the Mythic G: The jacket was an appropriate length and fit well in the shoulders, but the torso felt loose, and the sleeves were a bit long. On the plus side, between the loose fit and articulated sleeves, I enjoyed unrestricted range of motion. Although I usually prefer a slimmer, more athletic cut, especially for climbing, I believe that most people will find that the Mythic G offers a comfortable fit.
Mountain Hardwear Ghost Whisperer Hoody ($380): For Mild Conditions
The Mountain Hardwear Ghost Whisperer is one of the most popular ultralight down jackets for summer backpacking and other weight-conscious adventures in mild weather. It’s an ounce lighter than the Mythic G, but it packs in noticeably less insulation (3 oz. of 800-fill down compared to the Rab’s 4.5 oz. of 1,000-fill down). We recommend it for temperatures as low as 50 degrees Fahrenheit (potentially colder if you’re moving), and it’ll save you $145, too. However, if you need a jacket that will keep you warm in below-freezing conditions, the Mythic G is hard to beat. For more, read our review of the Mountain Hardwear Ghost Whisperer Hoody.
Arc’teryx Cerium Hoody ($400): Added Weather Protection for Less Money
The Arc’teryx Cerium Hoody doesn’t offer quite the warmth of the Mythic G, and it’s 2 ounces heavier, but it’s a better value thanks to a lower price tag and more durable face fabric. For $125 less, the Cerium contains 4 ounces of 850-fill down, plus synthetic insulation in moisture-prone areas like the collar and under the arms. It’s hard to do the math when comparing different fill weights and synthetic vs. no synthetic fill, but in practice, the Cerium is warm into the low-40s/upper-30s, while the Mythic G’s temperature range extends below freezing. If you have the cash, the Mythic is still the most intriguing ultralight choice for cold and dry conditions. But if you want to save or need the added protection from moisture, the Cerium Hoody is a solid pick. For more, read our review of the Arc'teryx Cerium Hoody.
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 Ghost Whisperer is one of our favorite ultralight down jackets, with a low weight, small packed size, and streamlined feature set. Its attractive, low-profile fit also works well in casual environments. However, the thin fabric is fragile and requires care.
Warmth
Weight & Packability
Comfort
Durability
Weather Resistance
Sustainability
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
Your wallet will no doubt feel much lighter if you buy the Rab Mythic G, but so will your pack. Offering maximum warmth and comfort for its minimal weight, this jacket is a great choice if you’re counting ounces on trips into the alpine where the temps will dip towards (and possibly under) freezing. If you’re a weight-conscious climber, skier, and fastpacker, put this one on the ol’ dream list—it’s a true technical tour de force with super-premium 1,000-fill-power down and a functional heat-reflective lining. But for casual or mild-weather outings where weight is less of a concern, we’d opt for a more traditional down jacket (think Patagonia Down Sweater) that offers more durability at a much lower cost.
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