The Arc’teryx Gamma SL ($160) is a standout in the lightweight softshell pant category. Its combination of stretch, durability, and weather resistance makes it ideal for hikers, climbers, and alpine travelers who want full mobility without sacrificing protection or long-term wear. Thoughtful touches like a built-in belt and zippered pockets add functional polish. It can feel a bit warm on hot days, and the premium price may deter some, but for serious mountain use, the Gamma SL delivers top-tier performance in a lightweight, versatile build.
Comfort & Mobility
Durability
Breathability
Weather Resistance
Features
Sustainability
Category
Light/midweight
Materials
86% nylon, 14% elastane
Weight
7.8 oz.
Waist
Snap/fly & built-in belt
Pros
Cons
Arc'teryx Gamma SL
For this season's top models, see our guide to the Best Hiking Pants.
The Arc’teryx Gamma SL earns top marks for its exceptional comfort and freedom of movement. The fabric blend—nylon with 14% elastane and a soft knit mesh liner—offers a smooth, stretchy feel that moves fluidly with the body while retaining just enough structure to stay supportive. Articulated patterning and a gusseted crotch further enhance mobility, and Arc’teryx’s refined fit helps the pants stay securely in place without feeling restrictive. All told, the Gamma SL is one of the least restrictive hiking pants we’ve worn, making it an excellent choice for everything from trail hiking and travel to scrambling and alpine climbing.
One Better Trail editor has long relied on the Arc’teryx Gamma SL for alpine rock climbing, citing its ability to accommodate high foot jams, long days on the wall, and the occasional alpine knee. She also calls out the built-in waistbelt as a major comfort win, keeping the pants firmly in place under a harness or hipbelt. The Gamma SL does stretch out slightly between washes, which is fairly standard for pants in this category. That said, compared to the Outdoor Research Ferrosi, the Gamma SL is just as soft and stretchy but offers a more structured, durable feel that holds its shape and performance better over time.
The Gamma SL is built to last, with a tough softshell nylon face fabric and the meticulous construction we’ve come to expect from Arc’teryx. Abrasion resistance is excellent, and unlike the Outdoor Research Ferrosi, the fabric doesn’t pill or show too many signs of wear. We’ve relied on the Gamma SL as a go-to climbing pant for everything from multi-pitch granite to sharp alpine routes, and it’s held up impressively well through seasons of heavy use.
That said, no pant is indestructible. One of our well-worn pairs has developed a few small holes, but they haven’t spread and are easy to patch with repair tape. The main weak point is the fabric on the thigh pocket, which wore thin from the pressure points caused by carrying a phone while climbing. This is a common issue in climbing pants, but one we’d love to see Arc’teryx address with a reinforced overlay in future iterations (for now, our Tenatious Tape reinforcement will do). Still, overall durability is among the best in class for such a lightweight softshell design.
The Gamma SL is about as lightweight as a softshell pant gets—significantly lighter than the standard Gamma—but it still feels more structured and substantial than truly minimalist hiking pants like the REI Co-op Trailmade. It’s well-suited for summer missions in the mountains, but in temps above 70°F, it can start to feel a bit too warm. On hotter approaches, we often hike in shorts and change into the Gamma SL at the base of a climb. For a thinner alternative, the Black Diamond Alpine Light Pant sheds the knit liner and feels more air-permeable overall.
That said, the Gamma SL’s knit liner is the reason it breathes as well as it does. It wicks moisture efficiently and prevents that sticky, plasticky sensation many synthetics develop with sweat. While we prefer the BD Alpine Light for warm days on the wall, the Gamma SL is the better hiking pant overall—its roomier fit promotes airflow, and the liner keeps things drier and more comfortable during high-output movement.
The Gamma SL’s softshell construction offers impressive protection for a lightweight hiking pant. The tightly woven fabric blocks wind far better than standard nylon options like the Patagonia Quandary, making it a strong pick for shoulder-season use or exposed, high-alpine terrain. The DWR finish is also a top performer, shedding light rain, mist, and even damp brush with ease.
Of course, these aren’t full-on rain pants. In steady precipitation, we found the fabric begins to wet out after about 15 minutes. On the bright side, it dries quickly and remains comfortable when damp, making the Arc’teryx Gamma SL a reliable choice for variable conditions and multi-day missions where fast drying is key.
Pockets
The Arc’teryx Gamma SL keeps it simple with three zippered pockets: two hand pockets and one on the thigh. While the absence of rear storage might be a downside for casual, everyday use, it’s a non-issue in the backcountry. All three pockets are zippered, which we appreciate for securely stashing a phone, lip balm, or Sour Patch Kids without worrying about items slipping out mid-hike or during a trailside break.
That said, our one recurring gripe—common across many climbing pants—is the durability of the thigh pocket. Stashing a phone there while climbing leads to repeated abrasion against rock, and over time, we’ve worn small holes into the fabric. It’s an easy fix with Tenacious Tape, but we’d love to see Arc’teryx reinforce this high-wear area in future versions. For now, the thoughtful pocket layout and zippered security make the Gamma SL a practical and low-fuss choice for technical missions.
Waistband, Cuffs, & Other Features
The Gamma SL keeps things streamlined with a minimalist feature set, but what’s included is well executed. The built-in belt is a standout: the women’s version we tested features a low-profile cinch on the right hip, while the men’s uses a more traditional metal hook and webbing loop. Both designs provide a secure, dialed fit and are especially appreciated given that the pants stretch slightly between washes. It’s a huge boon to be able to easily tighten the waist throughout a trip to ensure they continue to ride comfortably and stay put under a pack or harness.
One feature we wish Arc’teryx hadn’t skipped is adjustable hem cinches. Without them, we have to roll up the cuffs to keep the pants off our feet when wearing climbing shoes or sandals. To their credit, Arc’teryx did add grommets at each hem, allowing you to thread cord through and secure the cuffs under your boots or approach shoes for a gaiter-like effect.
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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.
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.
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.
Tester: 5’3” 103 lb., 25” inseam; 26.5” waist
Size tested: 00 Short
Arc’teryx consistently nails the fit, and the Gamma SL is no exception. The women’s version features a flattering, fitted silhouette that contours without feeling restrictive, while the men’s version has a roomier, regular cut. Both come in an impressive range of sizes and three inseam lengths, boosting your chances of finding that just-right fit. One tester described the pants as having a “trouser-like look”—trim but not tight, and far from sloppy. Thanks to the built-in belt, the mid-rise waist sits comfortably and stays put whether you’re hiking, scrambling, or lounging at camp. All in all, it’s one of the best-fitting hiking pants we’ve tested: streamlined and mobility-ready, with enough polish to look good around town too.
Arc’teryx Gamma ($200): Warm it Up
The Gamma Pant is the burlier sibling to the Gamma SL, with a thicker, heavier fabric that offers more warmth for shoulder-season use or cooler climates. The pants share the same high-end construction, fit, and feature set, although the standard Gamma tacks on cinchable hems at the cuffs—a useful addition for sealing out debris or tightening over climbing shoes. If you’re venturing into cooler conditions or need a more rugged softshell for mixed terrain, the Gamma delivers. But for most hiking applications, we think the lighter SL offers better versatility and all-day comfort. For a deeper dive, read our Arc'teryx Gamma Pant review.
Outdoor Research Ferrosi ($110): Easier on your Wallet
If you’re shopping in the lightweight softshell category, the Ferrosi is a solid alternative that comes in at a much lower price. Its fabric offers similar stretch and weight to the Gamma SL, but the durability trade-offs are clear: the Ferrosi tends to pill, shows wear more quickly, and its DWR finish wears off noticeably faster. It’s also less structured, which makes it more susceptible to snagging on rock. The Gamma SL, on the other hand, retains its shape better over time, wicks moisture more reliably, and looks far fresher after a season of hard use. The addition of zippered hand pockets is another key advantage, especially for securing essentials on the trail. We think the Gamma SL is worth the extra cash for its longevity and polish, but the Ferrosi remains a supremely comfortable, capable pick for more casual or cost-conscious users. For more, read our review of the Outdoor Research Ferrosi.
The lightest pant in the Gamma series, the SL blends the stretchy, weather-resistant performance of a softshell with a streamlined build tuned for mild mountain conditions. It’s an excellent choice for high-alpine travel in summer, but can feel overkill for warm, below-treeline outings.
Comfort & Mobility
Durability
Breathability
Weather Resistance
Features
Sustainability
Built for climbers and adopted by hikers and backpackers looking for a durable and protective pant for alpine environments, the Gamma is about as premium as it gets. The fit is exceptional, and all the details are thoughtfully sorted. Warmth and price should be your only hesitations.
Comfort & Mobility
Durability
Breathability
Weather Resistance
Features
Sustainability
The Ferrosi is a mainstay on the trail thanks to its comfortable, stretchy construction, do-all personality, and great temperature range. Just don’t expect a super premium build quality.
Comfort & Mobility
Durability
Breathability
Weather Resistance
Features
Sustainability
The Arc'teryx Gamma SL is a top choice for hikers, climbers, and other mountain-goers who need a lightweight softshell hiking pant that won’t hold them back. With its stretchy construction, impressive weather resistance, and abrasion-ready durability, it’s built for unrestricted movement and reliable protection on alpine missions—whether you’re scrambling, climbing, or navigating variable terrain. Some may find its lined construction a bit warm for approaches, but the SL remains impressively versatile across a range of conditions. Its clean, refined fit also pairs well with everyday layers without looking overly technical, adding to its off-trail appeal. Budget-conscious shoppers may hesitate, but it’s hard to beat this level of performance and longevity for the price.
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