Warmth
Comfort & Mobility
Breathability
Durability
Weight & Packability
Sustainability
Category
Technical
Weight
13 oz.
Fabric(s)
54% polyester, 35% nylon, 11% elastane
Styles
Full-zip hoody
Pros
Cons
REI Co-op Flash Hyperstretch
For this season's top models, see our guide to the Best Fleece Jackets.
The REI Co-op Flash Hyperstretch is built for movement, not max insulation. As part of REI’s backcountry-oriented Flash line, its focus is on breathability and stretch rather than warmth. Despite its medium thickness, it doesn’t trap heat particularly well, and during testing, I consistently found it better suited for mild to cool conditions or as a layering piece. On a February backpacking trip in Haleakalā, with summit temps in the 40s to 50s Fahrenheit, it was comfortable while hiking, but I needed a shell once the sun dipped. Likewise, during a snowshoeing trip near Bend in 30°F weather, it performed great on the move as a midlayer but wasn’t enough when stationary without additional insulation.
Compared to my other active fleece jackets, the Outdoor Research Vigor Quarter Zip and Vigor Hoodie, the REI Co-op Flash Hyperstretch sacrifices insulation for mobility and ventilation. It’s thinner and less insulating than both of those, but it offers improved breathability and a more athletic feel. For active use in moderate conditions, it hits a nice balance. But if you’re looking for a performance fleece that holds in more warmth—especially when you're standing still—Patagonia’s R1 Air Full-Zip is the better pick.
The Flash Hyperstretch blends athletic stretch and softness in a package that feels more like a performance hoodie than a traditional fleece. With 11% elastane in the fabric, mobility is excellent—it moves fluidly with the body and layers easily under a shell (provided the boxy cut doesn’t create too many issues with bunching). The smooth, hardface exterior slides effortlessly beneath outer layers, and the plush interior is soft against the skin. Even when zipped to the top, the collar remains comfortable, with no scratchiness or pressure against the chin. The overall feel is light, low-bulk, and breathable, making it easy to wear during a range of activities without restriction or overheating.
That said, among fleece jackets—which tends to excel in comfort—the Flash Hyperstretch sits just a notch below the top contenders. Compared to the premium Arc’teryx Kyanite, which uses Polartec fabric for superior plushness and mobility, the Flash feels slightly thinner and less luxurious. It also can’t quite match the ultra-soft coziness of Patagonia’s R1 Air. Still, for $100, it offers an excellent balance of next-to-skin comfort, stretch, and streamlined layering performance—especially for those who prioritize mobility over maximum softness.
Breathability is the Flash Hyperstretch’s standout trait, making it a quality choice for high-output activities like hiking, snowshoeing, and even light ski touring in moderate to cold temperatures. In testing, it performed impressively across climates—from snowshoeing near Bend to hiking in the humidity of Maui—never feeling swampy or overly warm. On a sunrise climb of Haleakalā, it vented heat effectively and stayed comfortable even during sustained uphill movement. As an outer layer, the fabric allows airflow in both directions, which helps shed excess body heat without clinging to the skin.
Compared to other fleeces in this category, the Flash Hyperstretch breathes more like a thick base layer than a traditional midlayer. It’s a superior ventilator compared with casual pieces like the Patagonia Lightweight Synchilla or Fjallraven’s Keb and nearly on par with top performers like Patagonia’s R1 Air and Outdoor Research’s Vigor Grid in ventilation (the hardface outer fabric holds it back ever so slightly here). If you prioritize heat release and comfort during movement over outright warmth, the Flash Hyperstretch delivers strong performance at a reasonable cost.
Durability is where our confidence in the REI Co-op Flash Hyperstretch begins to waver. While REI’s in-house gear can offer great value, this fleece leans a little too far toward the budget end. The fabric feels thin and more akin to athleisure wear than a technical midlayer built for mountain use. Stitching along the hood and cuffs isn’t reinforced and appears delicate, and there are early signs of fraying after just a few outings. The overall construction doesn’t inspire the long-term confidence we expect from backcountry-focused layers.
To its credit, the nylon face fabric isn’t prone to pilling, the zippers operate smoothly, and the jacket held up decently across roughly two weeks of hiking, snow layering, and casual wear in Maui and Bend. That said, the thin material and borderline flimsy build make it best suited for light use rather than heavy-duty adventuring. Fleece jackets aren’t generally known for being bombproof, but even by category standards, the Flash Hyperstretch feels less robust than premium alternatives from brands like Patagonia or Arc’teryx.
At 13 ounces for the men’s version, the Flash Hyperstretch hits squarely in the middle of the lightweight technical fleece jacket category. It’s nearly identical in weight to the Outdoor Research Vigor Grid (12.9 oz.) and Patagonia R1 Air (12.9 oz.), though notably heavier than The North Face’s ultralight Futurefleece (7.3 oz.). It doesn’t include a stuff sack or dedicated stow pocket, but it rolls easily into its own hood or compresses down to the size of a large grapefruit or 1-liter bottle. In real-world testing—whether on Haleakalā’s alpine slopes or snowshoeing in Oregon—it proved easy to pack and carry, offering reliable layering warmth without taking up a lot of precious space in a daypack or overnight load.
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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.
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 REI Co-op Flash Hyperstretch offers a fairly standard feature set for a lightweight, active fleece. The close-fitting hood is unstructured and feels more shallow than roomy—it fits comfortably over a beanie or ballcap but is too snug to accommodate a climbing or ski helmet. While there are no adjustment points, the elasticized construction helps the hood stay put during movement, with a good field of vision and solid performance in light wind.
Storage is basic but functional: two zippered hand pockets provide enough room for a phone, gloves, or snacks, and are placed at a convenient, non-intrusive height. However, unlike some competitors, the jacket lacks a chest pocket or thumb loops—features you do get on the Outdoor Research Vigor Grid, The North Face Futurefleece, and Patagonia’s R1 Air. Overall, the Flash Hyperstretch gets the job done, but doesn’t push the needle in the features department.
The REI Co-op Flash Hyperstretch is available in men’s sizes S to XXXL and women’s XS to XXXL. I opted for my usual men’s large, and while the fit initially felt a bit snug, the stretchy fabric quickly proved comfortable and easy to move in. It hugs the body more than expected—a little surprising given that REI products often run roomy and boxy—but never felt restrictive, even during high-reach movements, where the generous stretch really shines. The back and arm length offered full coverage without riding up, and while the silhouette might not be ideal for technical layering under a trim shell, it’s a solid match for everyday wear or moderate outdoor activity. Finally, there’s a cinch at the bottom hem for dialing in the fit if you find it too loose.
Outdoor Research Vigor Grid ($120): A Durability Boost
In contrast to the Flash Hyperstretch’s less-than-confidence-inspiring construction, the Vigor Grid Fleece Full Zip has held up wonderfully over time. One tester reported that she’d used it for two years with nary a loose thread, and so this model outpaces the Flash Hyperstretch despite having zero nylon in its fabric blend. Performance-wise, the Vigor Grid also prioritizes breathability and has a similar use case if your goal is to make miles in moderate to chilly conditions. (It’s slightly less warm than the Hyperstretch, though.) With thumb loops and a chest pocket—in addition to two hand pockets—the Vigor Grid is more full-featured, and it comes in more zipper configurations. If you’re sticking with the hooded full-zip version, we think the extra $20 compared to the Flash Hyperstretch is worth the spend. To learn more, see our Outdoor Research Vigor Grid review.
Mountain Hardwear Summit Grid Hoody ($95): More Affordable, Less Technical
If the Flash Hyperstretch’s price is its most appealing attribute to you, the Summit Grid Hoody is even cheaper (if not by much). It’s also a less technical piece, with a flowy cut that won’t work as well on an extended backpacking trip but is more comfortable if you’re hanging in town. The Summit Grid is also warmer, with midweight fleece fabric that’s best for slow-paced activities under approximately 50°F; as such, the Flash Hyperstretch is the better choice if you’re going fast. However, the Summit Grid’s uber-cozy fabric is among the most comfy materials we tested and will stand up to the test of time better than the former fleece’s thin construction. If you’re focused on saving money but less so on making miles, go with the Summit Grid. For savings-conscious speedsters, choose the Flash Hyperstretch. For more, read our review of the Summit Grid Hoody.
This light, flexible fleece works well as a breathable layer for high-output activities. The Flash Hypsterstretch is also reliably comfy and costs significantly less than other active fleeces, although it’s held back by middling durability and below-average warmth.
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
This simple fleece won us over with its ultra-soft feel and trendy (well, at least for mountain towns) aesthetic. The Summit Grid Hoody is a casual piece that you’ll appreciate much more on easygoing hikes than technical missions, though.
Warmth
Comfort & Mobility
Breathability
Durability
Weight & Packability
Sustainability
The REI Co-op Flash Hyperstretch is a great fit for active users who prioritize breathability and mobility over maximum insulation. It excels as a midlayer for high-output activities like hiking, snowshoeing, or mild-weather backpacking. If you want something soft, stretchy, and lightweight that moves well and disappears into your pack, the Flash delivers at a reasonable $100 price. But if warmth, ruggedness, or premium feel are high on your list, you’ll likely be better served by a higher-end and more well-rounded technical fleece jacket like the Patagonia R1 Air or Arc’teryx Kyanite.
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