Black Diamond Coefficient Fleece Hoody Review
Warmth
Comfort & Mobility
Breathability
Durability
Weight & Packability
Sustainability
Category
Technical
Weight
1 lb. 4.5 oz.
Fabric(s)
51% polyester, 36% nylon, 13% elastane
Styles
Full-zip hoody, quarter-zip
Pros
Cons
Black Diamond Coefficient Hoody
For this season's top models, see our guide to the Best Fleece Jackets.
The Black Diamond Coefficient Hoody is built for motion, not mellow hangs. Its grid-style Polartec Power Dry fleece is a proven performer in the high-output category, offering just enough warmth while prioritizing breathability and moisture management. This is the fleece I reach for when I know I’ll be pushing hard in the mountains—cold-weather hiking or winter-time trail running—not when I need something to keep me cozy at camp or to cut the chill around town. During several fast-and-light winter missions in Spain’s Picos de Europa, I stayed comfortable in the Coefficient while moving uphill in temps that hovered in the high 30s, especially when paired with a thin wind shell.
That said, warmth is relative. Compared to other ultralight active fleece jackets like The North Face Futurefleece or Outdoor Research’s Vigor Grid, the Black Diamond Coefficient Hoody provides a bit more insulation. But it still lags slightly behind Patagonia’s R1 Air, which feels thicker and retains more heat. It was also clearly less warm than the other two fleeces I was testing in this round—the Patagonia Better Sweater and Fjallraven Keb—both of which are far more insulated and better suited to lower-output use. Bottom line: if you keep moving, the Coefficient keeps up. Just don’t expect it to hold its own when you stop.
The Coefficient is one of the stretchiest fleece jackets we’ve tested—13% elastane gives it standout mobility that’s ideal for high-effort pursuits like climbing and ski touring. The fit is snug and technical, much like a base layer, and that close cut paired with the jacket’s excellent range of motion makes it feel dialed for activity. The collar hits right at the chin when zipped—just where it should for a performance fleece—and the stretch allows for full movement without restriction.
That said, comfort lags a bit behind mobility. The grid interior is soft, but the exterior prioritizes durability over plushness, and the overall feel is heavier and less cozy than alternatives like the Patagonia R1 Air or Arc’teryx Kyanite. In addition, I had a fit-related issue: unless I wore a tight-fitting base layer underneath, the fabric tended to bunch at the armpits, which felt annoying over time. Worn back-to-back with softer options, the Coefficient’s heft and firmer texture made it feel more utilitarian. It excels during motion but doesn’t invite lounging—more tool than comfort piece.
This is one of the most breathable fleece jackets we’ve tested—clearly built for movement in the mountains. The Coefficient’s grid-style Polartec Power Dry fleece is designed to wick sweat and shed excess heat efficiently, making it an ideal companion for high-output cold-weather pursuits. During a season of winter trail runs along Spain’s northern coast, I found it excelled across a wide range of conditions. When temps dipped into the 30s, I paired it with a thin wind shell and stayed warm while climbing uphill. And on warmer days around 50°F, it performed beautifully on its own without overheating.
Whether it’s an alpine start, a steep ski tour, or a chilly running session, this fleece regulates temperature extremely well. I’d rate it just a hair behind the Senchi Designs Alpha Direct A90 and The North Face’s Summit Series Futurefleece, and slightly more breathable than my Patagonia R1 or Fjällräven Keb. If breathability is a top priority, the Black Diamond Coefficient should absolutely be on your radar.
While the Black Diamond Coefficient Hoody is clearly a well-built technical layer—with solid stitching, smooth-running zippers, and an overall premium feel—it shows wear sooner than we’d like, especially for the price. After about 15 days of hiking and running in mountain terrain from January through May, I noticed visible signs of wear, particularly where the fabric made contact with velcro. The smooth exterior doesn’t play well with snag-prone materials—a problem if you plan to climb in it—and has begun fraying around the cuffs where velcro repeatedly caught the fabric.
That same sleek face fabric, while great for layering, also tends to reveal pilling and abrasion more quickly than a more traditional, medium- or high-pile fleece jacket. Unlike thicker fleeces that hide wear with texture and loft, the Coefficient’s polished surface puts every scrape and snag on display. It’s still a quality piece that should hold up structurally, but aesthetically, it may age faster than competitors—something to consider if you’re investing in it as a long-term, go-to active layer.
At 1 pound 4.5 ounces for the men’s hoody, the Black Diamond Coefficient is among the heaviest fleece jackets we tested—particularly for a piece marketed as active insulation. That’s a significant jump compared to other technical models like The North Face Futurefleece (7.3 oz.), Patagonia R1 Air (12.9 oz.), and Arc’teryx Kyanite (15 oz.). And just as notably, you can feel that extra heft from the build. It even outweighs some casual layers like the Patagonia Synchilla (13.2 oz.), which aren’t exactly optimized for high-output use. If your mission involves a lot of gear swapping and packing, the weight is a clear drawback.
That said, the Coefficient does pack down reasonably well for its bulk. Rolled into its hood, it compresses to roughly the size of a small cantaloupe—more compact than the Synchilla despite being heavier. But this isn’t the kind of fleece jacket you’re likely to toss in a bag “just in case.” In most scenarios where we brought the Coefficient, it stayed on the entire time. So while it doesn’t win any points for packability or ultralight efficiency, it remains functional for the right type of activity—namely, colder pursuits where it's your primary active layer from start to finish.
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Longevity
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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
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Recycled and/or Reduced Packaging
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Repair Services
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Resale and/or Recycling Services
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Carbon Footprint Tracking
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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 Black Diamond Coefficient Hoody keeps things simple but effective. Its standout element is the hood—snug, highly stretchy, and versatile enough to fit over a ballcap or under a helmet with ease. There’s sufficient room to layer a thick beanie underneath for colder outings, and the hood’s low-profile fit keeps it nicely in place even during high-effort activities.
Beyond the hood, features are minimal. A single chest pocket provides just enough space for essentials like a couple of energy gels, thin liner gloves, or even a small PBJ. Thumb loops at the cuffs are a thoughtful addition, offering a secure and comfortable fit that pairs nicely with gloves. While it lacks the hand pockets—a bummer for everyday wear—or adjustability of more feature-rich fleeces, the streamlined design matches its fast-and-light ethos.
Tester: 6’2” 175 lb.; 41" chest; 32" waist
Size tested: Men's large
Even among active fleece jackets, which tend to have trimmer cuts, the Black Diamond Coefficient Hoody’s very slim fit was a surprise. I tested a men’s large, which is my usual size across most brands (including other Black Diamond jackets), and found the Coefficient noticeably tighter than expected. The fit through the shoulders and armpits felt exceptionally snug, and I found myself wishing for a bit more room in both areas.
Length is another consideration. While the slim cut is great for minimizing bulk and maximizing performance, the waist hem lifts a little too high when I raise my arms—something to keep in mind for activities like climbing or ski touring where reach matters. Given how trim the cut is, some users may prefer to size up, especially if they want extra layering space or a bit more torso coverage.
The North Face Summit Series Futurefleece ($170): Light is Right
The Coefficient is one of the most breathable models we tested, but the Summit Series Futurefleece is the best-ventilating fleece in this roundup, period. At 7.3 ounces and 124 grams per square meter, it’s significantly lighter than the Coefficient (1 lb. 4.5 oz., 180 gsm) and our top choice for long trail runs, speedy alpine ascents, and keeping your personal thermometer in the comfort zone. Neither fleece is very feature-heavy, but we prefer the Coefficient’s thumb loops to the Futurefleece’s almost perfunctory version. The Coefficient and its thicker fabric will keep you slightly warmer, although it's still a lightweight model that doesn’t have insulation foremost in mind. And then there’s the price difference: Because the Coefficient costs $29 more, and because if you’re considering both these fleeces, you want a close-fitting, breathable layer, we recommend the less-expensive Futurefleece. For more, read our Summit Series Futurefleece review.
Outdoor Research Vigor Grid Fleece Pullover ($110): Save Cash, Wick Sweat
The Vigor Grid Fleece Pullover ranks right up there with the Coefficient for breathability, but the lightweight fleece presents better value. Like the Coefficient, it also features thumb loops, a chest pocket (which actually fits a cell phone), and a functional under-the-helmet hood. Its durability is fantastic, too. $90 is a huge price difference for a very small performance gap, as long as you can handle the pullover design. For more, check out our review of the Vigor Grid Fleece.
The Coefficient Hoody largely succeeds in its mission to provide a breathable, technical fleece layer for high-output days in the mountains. If you can get past its tight fit, surprisingly high weight, and wallet-draining price, this is a solid performance pick.
Warmth
Comfort & Mobility
Breathability
Durability
Weight & Packability
Sustainability
The featherweight Futurefleece feels more like a souped-up base layer than a traditional fleece midlayer. It’s cozy and breathable, although it doesn’t offer much weather protection or warmth. Still, we think this exemplary active piece is worth the price for ultralight and high-effort adventures.
Warmth
Comfort & Mobility
Breathability
Durability
Weight & Packability
Sustainability
The Vigor Grid line is Outdoor Research’s entry in the breathable, versatile fleece category. It’s comfy, surprisingly tough, and feature-filled while still being plenty light, although it lacks warmth if you’re standing still or run cold.
Warmth
Comfort & Mobility
Breathability
Durability
Weight & Packability
Sustainability
Is the Coefficient Hoody for You?
The Black Diamond Coefficient Hoody is a top choice if you need a fleece jacket built for hard-charging mountain pursuits like ski touring, winter trail running, or alpine approaches. It’s snug-fitting, highly breathable, and impressively mobile—everything you’d want for high-output efforts in cold conditions. But its extremely close fit, lack of casual comfort, and above-average weight make it less appealing for all-day wear or around-town versatility. If you're looking for a fleece jacket that thrives in motion and you're okay with a performance-oriented cut, the Coefficient delivers. Just be ready to keep moving.
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