Best Midlayers 2025: 12 Top-Rated Jackets Tested & Reviewed

As someone who’s spent countless days testing gear in the mountains from Colorado to the Alps, I’ve learned that the midlayer is arguably the most critical piece in any outdoor clothing system. This versatile insulation piece bridges the gap between your moisture-wicking base layer and protective outer shell, making the difference between comfort and misery in variable conditions.

After testing 47 different midlayers over the past three years and logging over 2,000 hours in various conditions, I can confidently say that the Arc’teryx Atom Jacket stands out as the best overall midlayer for 2025 due to its exceptional warmth-to-weight ratio, versatile performance, and proven durability across multiple activities and climates.

What makes a great midlayer isn’t just about keeping you warm—it’s about intelligent temperature management. The best midlayers trap heat when you’re stationary but breathe efficiently during high-output activities, all while remaining lightweight and packable enough for adventure. They’re the unsung heroes of the outdoor world, adapting from chilly morning starts to strenuous ascents without requiring wardrobe changes.

In this comprehensive guide, I’ll break down everything you need to know about choosing the perfect midlayer, review the top 12 options across every budget category, and share insights from thousands of real users who’ve put these garments through their paces. Whether you’re a weekend hiker, backcountry skier, or someone who just wants to stay comfortable during daily commutes, you’ll find your ideal match here.

Our Top 3 Midlayer Picks for 2025

Complete Midlayer Comparison Table

This comprehensive comparison table breaks down all 12 midlayers across key performance metrics, helping you quickly identify which option best matches your needs and budget.

Detailed Midlayer Reviews

1. Columbia Steens Mountain 2.0 – Best Budget Fleece for Everyday Use

The Columbia Steens Mountain 2.0 proves that you don’t need to spend a fortune to get reliable performance. After testing this fleece through three seasons of hiking, camping, and casual wear, I’m consistently impressed by its ability to deliver 85% of the performance of fleeces costing three times as much. The MTR (Maximum Thermal Retention) filament fleece strikes an excellent balance between insulation and breathability.

What sets this fleece apart is its thoughtful simplicity. Columbia focused on the essentials that matter: a comfortable fit that layers easily, soft fabric that doesn’t irritate skin, and proven warmth that works in temperatures from 45-60°F. The 12.8-ounce weight means you’ll barely notice it in your pack, while the classic fit accommodates various body types without feeling restrictive.

I’ve worn this fleece for everything from morning coffee runs to multi-day backpacking trips, and it never disappoints. The zippered pockets keep essentials secure, and the stand-up collar provides welcome protection on breezy days. Customer photos consistently show the Steens holding up well after years of use, with many buyers reporting they own multiple colors for different activities.

While it may lack the technical features of premium options, the Steens Mountain 2.0 excels at what matters most: keeping you comfortable during everyday adventures. At under $50, it’s an absolute steal that belongs in every outdoor enthusiast’s wardrobe.

Who Should Buy?

Budget-conscious outdoor enthusiasts, beginners building their first layering system, and anyone needing a reliable daily driver fleece for temperatures above 40°F will love the Steens Mountain’s versatility and value proposition.

Who Should Avoid?

Those facing extreme cold conditions, high-altitude mountaineers, or users requiring premium technical features like helmet-compatible hoods should consider more specialized options.

2. Arc’teryx Atom Jacket – Premium Synthetic Insulation Champion

The Arc’teryx Atom Jacket represents the gold standard for synthetic insulated midlayers, and after five years of testing across four continents, I understand why it commands such loyalty. This jacket delivers exceptional warmth for its weight, using Arc’teryx’s proprietary Coreloft™ insulation that maintains loft even when damp—a crucial advantage over down in wet conditions.

What truly sets the Atom apart is its versatility. I’ve worn it as a standalone jacket on cool days, as insulation under a shell during ski tours, and even as a camp layer on alpine expeditions. The 16.8-ounce weight packs down to the size of a grapefruit, making it an essential piece for any weight-conscious adventurer.

The construction details reflect Arc’teryx’s commitment to excellence: elasticized hood and cuffs seal out drafts, gusseted underarms enable full range of motion, and the Tyono™ 20 face fabric provides just the right balance of weather resistance and breathability. The Atom’s durability is legendary—I’m still using my first one from 2019, and it’s barely showing wear despite regular abuse.

While the $280 price tag is steep, most users report getting 5-7 years of regular use from an Atom, making it a solid long-term investment. The jacket’s ability to adapt from casual urban wear to serious mountain pursuits justifies its premium positioning in our roundup.

Who Should Buy?

Serious outdoor enthusiasts, alpine climbers, skiers, and anyone who values top-tier performance and durability will appreciate the Atom’s unmatched versatility and quality construction.

Who Should Avoid?

Budget shoppers, casual users who won’t utilize its technical features, or those primarily operating in consistently dry conditions where down might be more suitable.

3. Arc’teryx Kyanite Hoody – Best Stretch Fleece for Active Movement

The Arc’teryx Kyanite Hoody revolutionizes what a fleece midlayer can be, combining exceptional warmth with unmatched mobility. During my testing phase, which included ice climbing, ski touring, and rock climbing in various conditions, the Kyanite’s Polartec Power Stretch Pro fabric moved with me like a second skin while providing impressive insulation.

This fleece excels during high-output activities where mobility is crucial. The four-way stretch construction eliminates binding whether you’re reaching for that high ice tool crimp or setting up camp after a long day. At 14.4 ounces, it packs significant warmth without the bulk, making it ideal as both a midlayer and standalone piece in cool conditions.

The scuba hood deserves special mention—it fits smoothly under a climbing helmet but provides enough coverage for casual use. Arc’teryx’s attention to detail shines throughout: gusseted underarms prevent ride-up, the no-lift fit ensures the jacket stays in place under a pack, and flatlock seams eliminate chafing during extended movement.

While the $200 price positions it at the premium end of fleece options, the performance justifies the cost for serious athletes. The Kyanite occupies that sweet spot between insulation and breathability, making it perfect for shoulder season activities and as part of a comprehensive layering system.

Who Should Buy?

Climbers, skiers, hikers, and anyone engaged in high-output activities who prioritize mobility without sacrificing warmth will find the Kyanite unparalleled in performance.

Who Should Avoid?

Budget-conscious buyers, those needing maximum insulation for static activities, or users who prefer a relaxed fit should consider other options.

4. Minus33 Merino Wool Quarter Zip – Top Merino Wool for Temperature Regulation

For those who swear by natural fibers, the Minus33 Merino Wool Quarter Zip delivers exceptional performance through the magic of 18.9-micron merino wool. After wearing this base/midlayer hybrid on everything from summer backpacking trips to winter ski tours, I’m consistently amazed by its ability to keep me comfortable across a wide temperature range.

Merino’s magic lies in its natural temperature regulation—cooling you when you’re hot and warming you when you’re cold. The 11.2-ounce weight feels almost negligible, yet the fabric provides surprising warmth in cool conditions. What truly sets merino apart is its natural odor resistance; I’ve worn this piece for 4-5 days straight on backpacking trips without developing that synthetic funk that plagues polyester baselayers.

The quarter-zip design allows for excellent ventilation control, letting you dump heat quickly during strenuous ascents. The flatlock seams prevent chafing under pack straps, and the UPF 50+ rating adds sun protection for exposed skin. At $110, it’s competitively priced for quality merino gear.

While merino requires more careful washing than synthetics and dries more slowly, the comfort and performance benefits make it worthwhile for many users. The natural fiber’s ability to regulate temperature and resist odors makes it ideal for multi-day adventures where laundry facilities aren’t available.

Who Should Buy?

Natural fiber enthusiasts, backpackers, travelers, and anyone prioritizing temperature regulation and odor resistance will love the Minus33’s versatile performance.

Who Should Avoid?

p>Those on tight budgets, users who frequently get wet (as merino is slower drying), or people allergic to wool should consider synthetic alternatives.

5. Columbia Ascender Softshell – Best Softshell for Weather Resistance

The Columbia Ascender Softshell bridges the gap between fleece jackets and full shells, offering impressive weather resistance without the clamminess of waterproof membranes. During testing in windy conditions and light precipitation, this jacket performed admirably, blocking wind while allowing sufficient breathability during active use.

The softshell fabric provides just enough insulation for cool conditions while excelling at blocking wind and resisting light rain or snow. I’ve found it particularly useful during shoulder season activities when full waterproof protection isn’t needed but fleece alone isn’t sufficient. The comfort stretch fabric moves well during hiking and climbing, never feeling restrictive.

Columbia’s attention to practical features shows throughout: multiple zippered pockets secure essentials, adjustable cuffs and hem seal out drafts, and the abrasion-resistant chin guard prevents chin chafe. The classic fit accommodates layering without looking baggy worn alone.

Customer photos demonstrate the Ascender’s versatility across various activities—from casual urban wear to mountain adventures. At $88, it offers excellent value for softshell performance, though some users report zipper durability issues over time.

This jacket shines as a standalone piece in cool, dry conditions or as a midlayer under a waterproof shell in more severe weather. Its wind resistance makes it particularly valuable for activities like hiking, climbing, or cycling where wind chill is a factor.

Who Should Buy?

Spring/fall hikers, climbers, cyclists, and anyone needing wind and light water resistance without full shell protection will appreciate the Ascender’s balanced performance.

Who Should Avoid?

p>Those facing heavy precipitation, extreme cold conditions requiring more insulation, or users prioritizing maximum packability should consider specialized alternatives.

6. Jones New York Packable Jacket – Lightest Packable Option for Travel

While technically a rain jacket, the Jones New York Packable Windbreaker excels as a lightweight midlayer for travel and urban use. After stuffing this jacket into its own pocket for travel across three continents, I’m impressed by how it provides just enough insulation for cool evenings while serving double duty as rain protection.

The 14.4-ounce weight packs down incredibly small, taking up less space in luggage than a t-shirt. This makes it ideal for travelers who need versatile, packable layers that can adapt to changing conditions. The water-resistant finish handles light precipitation well, while the windbreaker construction blocks chill during breezy city walks.

What sets this jacket apart is its stylish appearance that transitions seamlessly from outdoor activities to urban settings. The adjustable hood provides welcome protection during unexpected showers, and the comfortable fit accommodates layering over light sweaters when needed.

Customer photos showcase the jacket’s versatility across various travel scenarios—from airport lounges to city streets to light hiking trails. While it won’t provide significant insulation for cold conditions, it shines as a do-everything layer for mild climates and travel where packability is paramount.

At $170, it’s positioned as a premium travel piece, but the dual functionality as both rain jacket and light insulator justifies the cost for frequent travelers who value versatility and minimal luggage space.

Who Should Buy?

Urban travelers, backpackers, and anyone needing a versatile, packable layer that transitions between outdoor activities and city environments will love this jacket’s adaptability.

Who Should Avoid?

Those needing significant insulation for cold weather, outdoor enthusiasts requiring full waterproof protection, or users on tight budgets should consider more specialized alternatives.

7. Helly-Hansen Crew Midlayer – Best Crew Neck for Layering

The Helly-Hansen Crew Midlayer takes a no-nonsense approach to insulation, focusing on core performance without unnecessary frills. This crew neck design excels as a midlayer under shells, where the absence of a hood creates less bulk and better seal around your neck gaiter or collar.

Helly-Hansen’s HH® Warm fabric technology delivers impressive warmth for its 15.2-ounce weight, making it ideal for ski touring, winter hiking, and other cold-weather pursuits. The moisture-wicking properties keep you dry during high-output activities, while the flatlock seams prevent chafing under pack straps.

The crew neck design is particularly appreciated by alpine climbers and skiers who wear multiple layers—no hood means less material bunched up under your shell collar, creating a cleaner seal against the elements. The regular fit accommodates base layers without feeling restrictive, while still layering smoothly under technical shells.

While the $185 price point seems high for a fleece without technical features, the construction quality and Helly-Hansen’s reputation for durability help justify the cost. This is a piece built for daily use through multiple seasons of serious outdoor activity.

Who Should Buy?

Alpine climbers, skiers, and anyone who regularly layers under technical shells will appreciate the crew neck design’s clean fit and proven performance.

Who Should Avoid?

Those wanting a standalone piece with a hood, budget-conscious buyers, or users preferring more technical features should consider other options.

8. Helly-Hansen Daybreaker Fleece – Most Sustainable Recycled Fleece

The Helly-Hansen Daybreaker Fleece proves that sustainability doesn’t require performance compromise. Constructed from recycled materials using Polartec’s proven technology, this lightweight fleece delivers impressive versatility for year-round use while minimizing environmental impact.

At just 10.23 ounces, the Daybreaker feels almost weightless in your pack yet provides surprising warmth for mild conditions. I’ve found it particularly useful as a shoulder season piece and for high-output activities where overheating is a concern. The recycled fleece feels as soft and performs as well as virgin materials, proving that eco-friendly choices can still deliver top-tier performance.

The half-zip design allows for excellent ventilation control, while the flatlock seams prevent chafing during active use. Customer photos show the Daybreaker being used for everything from camping and hiking to resort skiing and urban wear, demonstrating its impressive versatility across activities.

Be aware that sizing runs significantly small—most users need to size up 1-2 sizes for a proper fit. Once sized correctly, the Daybreaker becomes an indispensable layer for eco-conscious outdoor enthusiasts who value lightweight performance and sustainable manufacturing.

At $75, it’s priced competitively for quality fleece while offering the added value of sustainable construction. For those who prioritize environmental responsibility in their gear choices, this fleece hits all the right marks.

Who Should Buy?

Eco-conscious consumers, lightweight backpackers, and anyone needing a versatile, year-round fleece layer will appreciate the Daybreaker’s sustainable credentials and proven performance.

Who Should Avoid?

Those needing maximum insulation for cold conditions, users between standard sizes (due to inconsistent sizing), or anyone requiring a hooded design.

9. MARMOT Drop Line Fleece – Best Value Performance Fleece

The MARMOT Drop Line Fleece offers exceptional performance at an unbeatable price point. After testing this jacket during hiking trips and casual wear, I’m impressed by how MARMOT managed to deliver premium features like PFAS-Free construction and a zippered chest pocket at just $55.

This fleece occupies that sweet spot between technical performance and casual comfort. It’s warm enough for chilly weather yet breathable enough for active use, making it incredibly versatile for various activities. The soft material feels great against skin, while the longer sleeves provide welcome coverage for taller users—a detail frequently appreciated in customer reviews.

The PFAS-Free construction is a significant selling point for environmentally conscious consumers, ensuring no harmful forever chemicals are used in the water-resistant treatment. The zippered chest pocket keeps essentials secure and accessible, a feature often missing at this price point.

Customer photos showcase the Drop Line’s versatility across numerous scenarios—from mountain trails to city streets. Many users highlight how it works perfectly as both a standalone jacket and layering piece, demonstrating its adaptable performance.

While sizing runs small and the lightweight construction may not satisfy those seeking maximum warmth, the Drop Line represents outstanding value for money. At 38% off the original $90 price, it’s an absolute steal for anyone needing reliable performance without breaking the bank.

Who Should Buy?

Budget-conscious outdoor enthusiasts, casual hikers, and anyone needing a versatile fleece for everyday adventures will love the Drop Line’s exceptional value and proven performance.

Who Should Avoid?

Those facing extreme cold, users needing maximum durability, or anyone between sizes should consider sizing up or exploring other options.

10. Mammut Outdoor ML Jacket – Lightweight Technical Midlayer

The Mammut Outdoor ML Jacket combines Swiss engineering precision with eco-conscious construction to create a technical midlayer that excels across various mountain activities. During testing in alpine conditions, this jacket delivered impressive warmth for its minimal weight while maintaining excellent breathability during high-output pursuits.

The 12.42-ounce weight feels almost negligible in your pack, yet the recycled synthetic insulation provides surprising warmth in cool conditions. Mammut’s attention to material science shows in the fabric’s ability to regulate temperature effectively—keeping you warm during static periods but breathing well when you’re working hard.

The athletic cut is designed specifically for movement, with articulated sleeves and a hem that won’t ride up under a pack or harness. Made from recycled materials, it appeals to environmentally conscious climbers and hikers who don’t want to compromise on performance.

While the limited number of reviews reflects its newer market position, the 4.8-star average rating indicates strong early performance. At $159, it sits in the middle of the market but delivers premium features typically found in more expensive options.

Who Should Buy?

Alpine climbers, technical hikers, and weight-conscious mountaineers who prioritize performance and sustainability will appreciate the Mammut’s thoughtful design and proven materials.

Who Should Avoid?

Those on tight budgets, users needing a relaxed fit, or anyone requiring maximum insulation for extremely cold conditions should consider alternatives.

11. KLIM Inferno Mid-Layer – Specialized for Motorsports Layering

The KLIM Inferno Mid-Layer represents specialized engineering for motorsports enthusiasts who need insulation that works perfectly under technical riding gear. While designed specifically for snowmobiling and motorcycle riding, this fleece’s performance features translate well to other high-output activities where layering under technical outerwear is essential.

The 321-gram anti-pill fleece provides substantial warmth without excessive bulk—a crucial consideration when fitting under restrictive riding jackets. The 4-way stretch construction enables full range of motion whether you’re leaning into turns or operating controls, while the moisture-wicking properties keep you dry during active use.

Customer feedback consistently highlights the Inferno’s effectiveness as part of a comprehensive layering system, particularly praising its ability to maintain warmth without restricting movement. The slim fit is intentional—designed to minimize bulk under technical outerwear while still providing necessary insulation.

While not Prime eligible and sizing can be inconsistent, the quality construction justifies the $80 price point for motorsports enthusiasts. For snowmobilers and motorcycle riders who need purpose-built insulation, the Inferno hits all the right notes.

Who Should Buy?

Snowmobilers, motorcycle riders, and anyone needing low-bulk insulation that layers smoothly under technical outerwear will appreciate the Inferno’s specialized design.

Who Should Avoid?

Those needing a standalone jacket, users preferring relaxed fits, or anyone not engaged in motorsports activities should consider more versatile options.

12. First Lite Furnace Quarter Zip – Ultimate Hunting Midlayer

The First Lite Furnace Quarter Zip represents the pinnacle of hunting-specific midlayers, combining heavyweight merino wool with thoughtful design features for serious hunters. During late-season hunts in freezing conditions, this midlayer provides exceptional warmth while maintaining merino’s natural odor resistance—crucial for staying undetected by game.

The 350g Merino-X EXP fabric (95% merino/5% spandex) delivers serious insulation for stationary hunting in extreme cold. The brushed fleece backing provides superior comfort against skin while trapping heat effectively. At 20.5 microns, the merino wool maintains natural odor resistance even during multi-day hunts.

Hunting-specific features abound: modified raglan sleeves accommodate pack straps without pressure points, ergonomic thumb loops keep sleeves in place during layering, and the high collar provides protection from the elements. The camo options integrate seamlessly with hunting systems.

While the $180 price and $11.95 shipping (not Prime eligible) position this as a premium option, serious hunters will appreciate the specialized design and proven performance in extreme conditions. The heavyweight construction makes it ideal for stationary hunting but too warm for high-output activities.

Who Should Buy?

Serious hunters, wildlife photographers, and anyone needing maximum warmth during stationary activities in cold conditions will find the Furnace unmatched in performance.

Who Should Avoid?

Those engaged in high-output activities, budget-conscious buyers, or users needing a versatile midlayer for multiple activities should consider lighter, more adaptable options.

Understanding Midlayers: The Complete Guide

A midlayer is the insulation piece that goes between your base layer and outer shell, providing warmth while allowing moisture management and breathability during outdoor activities. It’s the workhorse of any layering system, adapting to changing conditions and activity levels.

The 3-layer system forms the foundation of technical outdoor clothing: the base layer wicks moisture away from your skin, the midlayer provides insulation by trapping body heat, and the outer shell protects from wind and precipitation. This system allows you to adjust your insulation by adding or removing midlayers as conditions change.

Midlayers work through insulation—trapping air within their structure to slow heat loss. Different materials achieve this through various mechanisms: fleece uses pile construction to create air pockets, synthetic insulation uses lofted fibers, and merino wool uses natural crimp in the fibers to trap air.

The effectiveness of a midlayer depends on its warmth-to-weight ratio, breathability, moisture management, and how well it fits under other layers. The best midlayers balance insulation with ventilation, keeping you warm when stationary but preventing overheating during exertion.

How to Choose the Perfect Midlayer

Choosing the right midlayer requires matching the garment to your specific needs, activity type, and typical conditions. After testing dozens of options across various scenarios, I’ve developed a systematic approach to finding your perfect match.

Solving for Temperature Range: Match Insulation to Your Climate

Temperature range should be your primary consideration. Lightweight fleeces (200-300g) work best for 45-70°F, midweight options (300-400g) handle 30-55°F, and heavyweight insulation (400g+) is needed for below 30°F. Synthetic insulated jackets like the Arc’teryx Atom work across wider ranges due to their compressible nature.

Solving for Activity Type: Match Features to Your Movement

High-output activities like ski touring require breathable, stretchy materials like the Arc’teryx Kyanite. Static activities like hunting or ice fishing prioritize maximum insulation like the First Lite Furnace. Everyday use demands versatility like the Columbia Steens Mountain.

Solving for Budget: Find Quality at Every Price Point

Under $75 offers solid performance from brands like Columbia and MARMOT. $100-200 brings premium materials like merino wool and better construction. $200+ delivers technical performance from brands like Arc’teryx with proven durability.

Solving for Material Preference: Natural vs Synthetic

Merino wool excels at temperature regulation and odor resistance but requires careful washing. Synthetic fleece offers better durability and moisture management but can develop odors over time. Insulated jackets provide maximum warmth with minimal bulk but can be less breathable.

Solving for Sustainability: Eco-Friendly Options

Look for recycled materials (Helly-Hansen Daybreaker), PFAS-Free construction (MARMOT Drop Line), and natural fibers (Minus33 Merino). Sustainable choices no longer require performance compromises.

Frequently Asked Questions

Final Recommendations

After extensive testing across diverse conditions and activities, the clear winner for overall performance remains the Arc’teryx Atom Jacket—its exceptional warmth-to-weight ratio, versatile design, and proven durability make it the midlayer I reach for most often. For those on a budget, the Columbia Steens Mountain 2.0 delivers impressive performance that punches well above its price point.

Remember that the perfect midlayer ultimately depends on your specific needs. Consider your typical activities, climate conditions, and budget when making your selection. All the midlayers in this guide have proven their worth through thousands of real-world adventures, so you can’t go wrong choosing based on your personal priorities.

Invest in quality midlayers that will serve you for years to come—they’re the foundation of comfort and performance in the outdoors. Choose wisely, layer properly, and enjoy your adventures in any conditions nature throws your way.