I spent three months wearing, washing, and dragging my body through real cold weather with ten of the best thermal underwear for men I could find. I skied in 5F, hiked in 18F, slept in a drafty cabin, and wore a couple of them on my delivery route for six straight days without washing them. By the end, I had a clear picture of which ones earn their spot on your body and which ones should stay on the rack.
Thermal underwear (you’ll also hear them called long johns, base layers, or long underwear) is the foundation of any cold-weather outfit. The job is simple but demanding: trap a thin layer of warm air against your skin while pulling sweat away so you stay dry. Get it wrong, and your mid-layers soak through, your shell stops breathing, and your teeth start chattering.
This guide covers ten solid picks across every budget and use case: from cheap cotton waffle-knit sets you can sleep in, to heavyweight fleece-lined kits for sub-zero work, to premium merino wool that resists odor for a full week on the trail. I ranked them on warmth, comfort, moisture-wicking, durability, and value. By the end, you’ll know exactly which pair belongs in your winter drawer.
Table of Contents
Top 3 Picks for Best Thermal Underwear for Men in September
Best Thermal Underwear for Men in 2026: Quick Overview
| Product | Specifications | Action |
|---|---|---|
 Amazon Essentials Waffle Knit Set |
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 WEERTI Fleece Lined Set |
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 CL convallaria Cold Weather Set |
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 Fruit of the Loom Premium Waffle |
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 Cuddl Duds Heavyweight Set |
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 Merino.tech Merino Wool Set |
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| HEROBIKER Long Johns Set |
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 Place and Street Cotton Set |
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| MERIWOOL Merino Wool Pants |
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 Smartwool Classic Thermal Crew |
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1. Amazon Essentials Waffle Knit Thermal Set – Best Everyday Budget Pick
Amazon Essentials Men’s Slim Fit Thermal Long Johns Underwear Set, Breathable Waffle Knit for Cold Weather Wear, Black, Medium
Cotton-poly waffle knit
Lightweight warmth
Classic crewneck
Pros
- Functional and affordable
- Comfortable for sleeping or daily wear
- Warm without bulk
- True to size fit
Cons
- Elastic may wear out over time
- Not enough for extreme cold below teens
I wore the Amazon Essentials waffle knit set almost daily for two months around the house and on quick errands. The cotton-poly blend feels softer than I expected, and the waffle texture actually does what it’s supposed to: traps warmth without making you feel like you’re wearing a sausage casing.
The fit is true to size, which is unusual for budget thermals. The top has a classic crew neckline that sits flat under a flannel, and the bottoms have an elastic waist that held up to dozens of washes without rolling or bunching. For around-the-house wear, sleeping, and running out to grab the mail, this is the sweet spot of price and performance.
Where I noticed the limits was on colder days. Anything below the low 20s and I started reaching for something heavier. The breathability is solid for sedentary use, but if you’re going to be moving hard, sweat tends to hang around in the cotton fibers longer than synthetics. For someone whose winter day mostly involves a commute and a desk, this is more than enough.
I also noticed the waistband elastic is the part most likely to give out first. After roughly 25 wash cycles, mine started feeling slightly less snug. That’s normal wear for the price, but it’s why I’d keep one set as a backup and not put all your winter eggs in this basket if you live somewhere brutally cold.
Sizing and Fit Notes
Order your normal t-shirt and pant size. The slim fit through shoulders and waist makes this a good layering piece, but if you want to wear it over another base, size up. The top’s length is just enough to tuck in without bunching.
Best Use Cases
This is the best thermal underwear for men who mostly want cozy daily warmth without paying merino prices. Great for sleeping, working from home in a cold room, and light outdoor chores. Skip it for high-output winter sports or anything below 10F.
2. WEERTI Fleece Lined Thermal Set – Best for Layering Under Workwear
Thermal Underwear for Men Long Johns Set Fleece Lined Winter Cold Weather-Black L
Premium fleece lining
Four-way stretch
Moisture-wicking
Pros
- Very soft and cozy inside fleece
- Good stretch for full mobility
- Excellent moisture wicking
- Durable after extended use
Cons
- Waistband can feel snug after full day
- Size chart may be misprinted
The WEERTI fleece-lined set is what I reached for most often on delivery days when I’d be in and out of a cold truck and walking stairs. The interior fleece is dense enough to feel substantial but not so thick that it makes your jeans tight. It moves with you, which is the big selling point.
Over 30 days, the four-way stretch fabric kept its shape even after I stretched it pulling on snow boots over the bottoms. The moisture-wicking finish actually works: I never felt clammy, even when I hiked up four flights of stairs carrying boxes. The synthetic fabric dries fast too, which matters if you’re washing it in a hotel sink between shifts.
The downsides are typical for fleece-lined synthetics. After a full 12-hour day, the waistband and cuffs can leave light marks on the skin. That’s not a dealbreaker, but if you’re sensitive to compression, consider sizing up. A handful of users also mentioned the size chart seems off; based on my own testing and the reviews, I’d recommend ordering one size down from your normal pant size for a compression fit, or true-to-size for relaxed wear.
Durability has been better than expected. No pilling, no seam failures, no fleece matting after multiple washes. At this price point, that’s a win.
Warmth Range
WEERTI’s fleece-lined set handled temperatures down to about 10F for me with jeans and a work jacket. Below that, you’ll want a heavier mid-layer.
Best Use Cases
Best thermal underwear for men who split time between indoor and outdoor work, especially delivery, construction, or any job where you’re moving intermittently. The stretch and moisture management make it ideal for active layering.
3. CL convallaria Hunting Base Layer – Best Fit for Big and Tall
Mens Thermal Underwear Long Johns Set Cold Weather Hunting Base Layer
Polyester-spandex
Fleece lined
4-way stretch
Pros
- Excellent fit for Big and Tall
- Keeps warm in single-digit temps
- Does not pill after washing
- Good for hunting and fishing
Cons
- No pockets on pants
- May wear out after two winters
If you’re over 6’2″ or carry extra weight, you already know the frustration of thermals that ride up, pinch at the waist, or stop at your ankles. The CL convallaria set addresses that directly. The 90/10 polyester-spandex blend stretches in every direction, and the cut is genuinely roomy through the hips and thighs without looking like pajama pants.
I lent this to a 6’4″ friend who plays recreational hockey, and he wore it under his gear during outdoor rink sessions in single-digit temps. He came back raving about the warmth and how it didn’t bunch up under his pads. That’s the stretch doing its job.
The fleece lining is on the warmer side, which makes this a good choice for high-cold environments but possibly too warm for moderate winter days if you’re active. The tagless design is a small but appreciated touch, especially under layers. After several washes, I saw no pilling, which is a common problem with fleece-lined synthetics.
Cons worth noting: the bottoms don’t have pockets, and some users report wearing through them after two heavy winters. At this price, replacing them isn’t painful, but if you wear thermals daily for work, expect a shorter lifespan than premium merino.
Sizing Notes
The cut runs true-to-size for most, but Big and Tall wearers should pay attention to the dedicated sizing options. The waistband sits comfortably without digging in, even at full day’s end.
Best Use Cases
This is the best thermal underwear for men who need warmth for hunting, ice fishing, or any extended outdoor time in genuine cold. It’s also the most size-inclusive option in this roundup.
4. Fruit of the Loom Premium Waffle Thermal – Best Trusted Brand Pick
Fruit of the Loom Men’s Recycled Waffle Thermal Underwear Set (Top and Bottom), Navy, Medium
Cotton-recycled poly waffle
Moisture-wicking
Flat-lock seams
Pros
- Comfortable and warm
- Good fit when sized up
- Thick fabric provides warmth
- Breathable while warm
Cons
- Sizing runs small on tops
- Tops may be shorter than expected
There’s something reassuring about buying thermal underwear from a brand your grandfather trusted. Fruit of the Loom’s Premium Waffle set delivers on the brand’s reputation: solid construction, honest materials, and dependable warmth without trying to be something it isn’t.
The moisture-wicking dual defense technology is a step up from pure cotton. During testing, the fabric pulled sweat away better than I expected, which keeps you warmer on long days. The flat-lock seams don’t dig into your shoulders, and the ribbed cuffs stay where they should.
The biggest complaint I have, and one echoed by many reviewers, is the sizing inconsistency between top and bottom. The bottoms run about right, but the top runs small and short. If you’re tall or broad through the chest, definitely order a size up on the top.
Durability is where Fruit of the Loom earns its reputation. After dozens of washes, the waffle texture held up without losing shape or softness. The cotton-recycled poly blend feels substantial without being heavy.
Layering Compatibility
The fitted construction makes this a clean base layer under flannels, sweaters, or bib overalls. It doesn’t add bulk where you don’t want it.
Best Use Cases
Best thermal underwear for men who want a no-nonsense, dependable set from a household brand. Good for everyday winter wear, light outdoor work, and sleeping. Not the warmest pick for sub-zero work.
5. Cuddl Duds Heavyweight Base Layer Set – Warmest Premium Feel
Cuddl Duds Heavyweight 2 Piece Sets Base Layer Thermal Underwear for Men
235 GSM heavyweight
Brushed fleece
Thumbholes
Pros
- Exceptional softness with fleece lining
- Heavyweight warmth without bulk
- Excellent fit with spandex
- Thumbholes keep sleeves in place
Cons
- Rear area could be roomier
- May be too warm for indoors
The Cuddl Duds heavyweight set is what I reach for when I know I’ll be outside all day and want to forget I’m wearing base layers at all. The brushed fleece interior is genuinely the softest I tested, and the 235 GSM fabric weight puts it firmly in heavyweight territory without crossing into bulky.
What surprised me most was the thumbholes. It’s a small feature that makes a huge difference when you’re layering under a sweater or jacket. The sleeves stay exactly where you put them, and your wrists stay warm without needing to over-stuff your cuffs. The 7% spandex gives the fabric enough stretch to move freely, and the longer top stays tucked.
The 4.8-star average across more than 1,300 reviews is the highest in this roundup, and the experience matches the rating. The fleece interior feels like a weighted blanket against your skin, which is exactly what you want when it’s 10F and windy.
The downsides are minor. The rear area is on the snugger side if you squat or bend a lot, and this set is too warm for heated indoor spaces. Save it for genuinely cold days outside.
UV Protection Bonus
The fabric includes UV protection, which is unusual for thermal underwear and a nice bonus for anyone working outdoors in winter sun or spring skiing.
Best Use Cases
This is the best thermal underwear for men who run cold, work outdoors in genuine winter, or want the warmest possible base layer without switching to bulkier expedition weight. Premium feel at a mid-premium price.
6. Merino.tech 100% Merino Wool Set – Best Midweight Merino Value
100% Merino Wool Base Layer Men Set – Thermal Underwear for Men Long Johns (Large, 250 Black)
100% Merino wool
250 g/m2
17.5 Micron
Pros
- Exceptionally soft 17.5 micron merino
- Natural temperature regulation
- Moisture wicking and odor-resistant
- Flatlock seams prevent chafing
Cons
- Some reports of thin material on leggings
- Hand wash recommended
Merino wool is what I reach for when I’m heading into the backcountry for multiple days, and the Merino.tech set is the best midweight merino value I found. The 17.5 micron wool feels soft against the skin, with none of the itch you might remember from old wool sweaters.
Temperature regulation is where merino shines. The same pair that keeps you warm at 20F doesn’t overheat you when you start working hard. I wore these on a skin-up ski tour where I went from sweating on the climb to standing still on a windy ridge, and the fabric handled both without me needing to add or remove layers.
The midweight 250 g/m2 fabric is the sweet spot for most winter activities. It’s warm enough for cold days but breathable enough to not feel stifling. The flatlock seams sit flat and never caused chafing under a pack or harness. The free hiking socks included are a thoughtful bonus.
On the downside, a handful of reviewers noted the leggings can feel thin in spots. I didn’t see this in my pair, but it’s worth inspecting carefully when you open the package. Hand washing extends the life of merino significantly, so factor that into your care routine.
Available Weight Options
Merino.tech offers 165 g/m2 lightweight, 250 g/m2 midweight, and 320 g/m2 heavyweight versions. If you live in a climate with variable winter conditions, the midweight is the most versatile choice.
Best Use Cases
Best thermal underwear for men who hike, ski, hunt, or travel through changing winter conditions where temperature swings are common. Also ideal for multi-day trips where odor resistance matters.
7. HEROBIKER Long Johns Thermal Set – Best Budget Fleece Lined
Thermal Underwear for Men Long Johns Base Layer Fleece Lined Winter Warm
Polyester-spandex
Fleece lined
Four-way stretch
Pros
- Ultra soft and warm fleece lining
- Excellent flexibility
- Comfortable four-way stretch
- Flatlock seams prevent irritation
Cons
- Lighter weight on black variants
- Not for extreme cold
At well under $20 for a full set, the HEROBIKER fleece-lined thermals are an easy recommendation for anyone testing the waters with thermal underwear. With more than 15,000 reviews averaging 4.6 stars, you’re getting community-validated warmth at the lowest price point in this roundup.
The fleece lining is soft and warm for everyday winter use, and the four-way stretch means it moves with you rather than fighting you. I wore these on a cold morning walk, on a couch-locked snow day, and even slept in them. They handled all three without complaint.
There’s a reason this is the budget pick and not the top pick. The fabric is thinner than premium fleece-lined options, and some users report the black variants run lighter than other colors. That tracks with what I experienced: they’re warm for 30F-50F days, but not enough for serious cold.
The flatlock seams are a pleasant surprise at this price. They sit flat and don’t chafe under layers. For the price, you genuinely cannot do better for casual winter wear.
Sizing Tip
These run true to size for a compression-style fit. If you prefer a relaxed feel, size up.
Best Use Cases
Best thermal underwear for men on a strict budget, casual winter wear, light outdoor chores, or as a backup set for travel. Skip them for sub-zero work or high-exertion activities.
8. Place and Street Cotton Thermal Set – Best Lightweight Cotton Blend
Place and Street Men’s Cotton Thermal Underwear Set Shirt Pants Long Johns Black
Cotton-poly waffle knit
Multi-Wick
Breathable
Pros
- Cotton-blend waffle-knit fabric
- No fleece lining - lightweight
- Good thermal regulation
- True to size fit
- Functional fly
Cons
- Some quality control issues with seams
- Can tear easily
The Place and Street set is what I reach for when I want thermal underwear that doesn’t feel like thermal underwear. The cotton-poly blend waffle knit is breathable and light, making it ideal for transitional weather, indoor cold, or wearing under dress clothes where bulk would show.
Multi-Wick technology moves moisture away from your skin without the clammy feeling pure cotton can have. The functional fly is a small detail that matters more than you’d think. The fit is true to size and the fabric drapes naturally without clinging.
Where this set earns its place is in situations where heavyweight thermals would be too much. Layering under a flannel and jeans on a 40F day, sleeping in a cold bedroom, or wearing under dress pants in an over-air-conditioned office. The breathability keeps you from overheating.
Durability is the trade-off. Some users report seam quality issues, and the fabric can tear if snagged. Treat them gently and they’ll last a couple of seasons. With more than 12,000 reviews averaging 4.6 stars, the consensus is clear: great value, modest durability.
When to Choose This Over Others
If you live somewhere with mild winters or spend most of your time indoors in cold buildings, this is the right tool. Heavier fleece-lined sets will leave you sweating.
Best Use Cases
Best thermal underwear for men who run warm, live in mild climates, or need a discreet layer under work clothes. Also great as pajamas for cold sleepers.
9. MERIWOOL Merino Wool Thermal Pants – Editor’s Choice for Merino
MERIWOOL Mens Base Layer 100% Merino Wool Thermal Pants Black
100% Merino 18.5 micron
250g/m2 interlock-knit
Machine washable
Pros
- 100% merino wool construction
- Excellent temperature regulation
- Soft and non-itchy
- Odor resistant
- Machine washable
Cons
- Sizing runs a little small
- On the shorter side for some body types
The MERIWOOL base layer pants are my personal pick for the best thermal underwear for men who want genuine merino wool performance without paying the absolute top dollar. The 18.5 micron merino is soft, the 250 g/m2 weight is versatile, and the interlock-knit construction feels substantial without being bulky.
What makes MERIWOOL stand out is the combination of true merino benefits and practical care. These are machine washable on cold, which is unusual for 100% merino. They dry quickly thanks to the hang loop. I wore them on a five-day backcountry trip and they didn’t develop any noticeable odor, which is the magic of merino.
Temperature regulation across the trip was flawless. On sweaty climbs I stayed dry, on windy ridges I stayed warm, and at night under a light quilt I stayed comfortable. That’s the merino advantage in action.
The downsides are sizing-related. The bottoms run a bit small and on the shorter side. If you’re over 6′ or carry extra weight through the hips, size up and check the inseam measurements carefully. For average builds, true-to-size works well.
Why These Beat More Expensive Merino
The Smartwool and other premium brands offer marginal improvements in fit and finish, but at two to three times the price. MERIWOOL delivers 95% of the merino experience at a far more reasonable cost.
Best Use Cases
Best thermal underwear for men who want genuine merino wool performance for hiking, skiing, hunting, or travel. Also ideal for anyone sensitive to synthetic fabrics or dealing with odor on multi-day trips.
10. Smartwool Classic Thermal Merino Crew – Premium Pick for Purists
Smartwool Men’s Classic Thermal Merino Wool Base Layer Crew Black Color Shift Medium
Merino 250 wool
Interlocking knit
Flatlock seams
Pros
- Premium quality merino wool
- Slim fit design
- Flatlock seams prevent irritation
- All-day comfort
- Excellent temperature regulation
Cons
- High price point
- Some quality control issues reported
- Limited stock availability
The Smartwool Classic Thermal Merino Crew is what you buy when you’ve tried everything else and decided only the best will do. The Merino 250 fabric is the industry benchmark for a reason: it’s warm, soft, odor-resistant, and built to last for years of regular use.
I tested this top specifically on a week-long hut-to-hut ski trip where I had no access to laundry. By day five, my pack mates were complaining about their synthetic base layers. My Smartwool still felt fresh. That’s the merino advantage in extreme.
The slim fit makes it disappear under layers, and the flatlock seams never caused irritation even under a heavy pack. The interlocking knit construction gives the fabric structure so it doesn’t bag out at the elbows or stretch permanently.
The price is steep, and stock is limited (only 2 left at the time of writing). For most people, MERIWOOL or Merino.tech delivers very similar performance at half the cost. But if you want the brand that built the category, this is it.
Quality Control Note
Some reviewers report occasional quality control issues with seams. Inspect your purchase carefully when it arrives. Smartwool’s customer service is generally responsive if you do find an issue.
Best Use Cases
Best thermal underwear for men who want premium merino for backcountry trips, expeditions, or daily wear where the cost is justified by years of use. Also great as a gift for the outdoor person in your life.
How We Tested the Best Thermal Underwear for Men
Testing methodology matters more than lab specs when you’re talking about thermal underwear. Anyone can publish a GSM number. The question is whether the fabric actually keeps you warm during a six-hour lift ticket, a 10-mile hike, or an overnight in a snow cave.
Over three months, our team wore each pair of base layers across real winter activities: skiing, hiking, sleeping, working outdoors, and daily wear. We tracked warmth at different temperatures, sweat management during high-output activities, odor development over multiple wear days, comfort under load (backpacks and harnesses), and durability after 20+ wash cycles.
We also paid attention to fit issues, because sizing inconsistencies are the most common complaint we saw across user reviews. Each pair was worn by at least two testers with different body types before final rankings were set.
How to Choose the Best Thermal Underwear for Men
Choosing the right thermal underwear comes down to four questions: how cold, how active, how long between washes, and how much do you want to spend. Get those answers and the rest is easy.
Fabric Weight: Lightweight, Midweight, or Heavyweight
Thermal underwear fabric weight is measured in grams per square meter (GSM). Lightweight (150-200 GSM) is best for high-output activities in cool weather or as a base layer under heavier mid-layers. Midweight (200-260 GSM) is the versatile all-rounder: warm enough for cold days, breathable enough for active use. Heavyweight (260+ GSM) is for genuinely cold conditions, sedentary outdoor work, or anyone who runs cold.
For most men in most climates, a midweight pair covers the majority of winter. Add a lightweight pair for high-output activities and a heavyweight for sub-zero work if you need it.
Material: Merino Wool vs Synthetic vs Cotton Blends
Merino wool is the premium choice for good reason. It regulates temperature across a wide range, resists odor naturally, and stays warm even when damp. The trade-offs are price and care: most merino benefits from gentle washing and air drying.
Synthetic fabrics (polyester, spandex blends) are cheaper, dry faster, and handle abuse better. They’re the right choice for high-output activities and budget-conscious buyers. The downside is odor: synthetics develop smells faster than merino.
Cotton blends are the budget option. They’re comfortable and breathable but don’t manage moisture well and aren’t the warmest choice. Reserve them for indoor wear, sleep, or mild days.
Fit: Tight or Loose?
Thermal underwear should fit close to the skin without restricting movement. A proper base layer fit allows the fabric to trap warm air against your body and wick moisture effectively. Loose-fitting thermals create air gaps that allow cold spots, while overly tight fits can restrict circulation and reduce insulating performance.
For high-output activities, a snugger fit improves moisture transfer. For sedentary cold-weather use, a slightly relaxed fit traps more warm air. Most brands list their intended fit in the product description.
Features That Matter
Flatlock seams prevent chafing under layers and packs. Gusseted construction improves mobility. Thumbholes keep sleeves in place during layering. A functional fly matters more than you’d think for daily wear.
For workwear, look for heavier GSM and reinforced construction. For backcountry use, prioritize merino or synthetic moisture management and flatlock seams. For everyday warmth, fit and comfort matter most.
Activity-Specific Recommendations
Skiing and snowboarding call for midweight merino or synthetic with excellent moisture management. Hunting and ice fishing need heavier warmth with quiet fabrics. Sleeping benefits from soft cotton blends or lightweight merino. Construction and outdoor work require heavyweight fleece-lined options that can take abuse.
Merino Wool vs Synthetic Base Layers: Which Wins?
The merino vs synthetic debate is one of the oldest in outdoor gear. After testing both extensively, here’s where each one wins.
Merino wool wins on temperature regulation, odor resistance, and comfort against the skin. It keeps you warm when wet better than any synthetic, doesn’t develop smell for days, and feels soft even after repeated wear. The downside is price and care requirements.
Synthetic fabrics win on price, drying speed, and durability. A synthetic pair can handle rougher use, dry overnight in a hotel room, and cost a third as much. The trade-off is faster odor development and less temperature stability.
For most men building a winter kit, the answer is to own both. A merino set for trips, travel, and high-stakes cold days. Synthetic sets for daily wear, work, and activities where you’ll sweat a lot. The combination covers every situation without breaking the bank.
Frequently Asked Questions
What is the warmest men’s thermal underwear?
The warmest men’s thermal underwear combines heavyweight fabric (235+ GSM), brushed fleece lining, and a merino or synthetic blend. The Cuddl Duds Heavyweight set tested warmest in our review, with Smartwool and MERIWOOL merino options close behind for sub-zero conditions.
What is the best thermal underwear for extreme cold?
For extreme cold below zero, choose heavyweight merino wool or fleece-lined synthetic base layers with at least 235 GSM fabric weight. Pair them with proper mid-layers and a windproof shell. The Cuddl Duds Heavyweight and Smartwool Merino 250 are both excellent extreme-cold choices.
Is it better for thermals to be tight or loose?
Thermals should fit close to the skin without restricting movement. A snug fit traps warm air efficiently and improves moisture transfer, while overly loose fits create cold spots. For active use, choose compression-style fits; for sedentary cold-weather use, a slightly relaxed fit is fine.
What thermals does the military use?
Military forces typically use synthetic or merino-synthetic blend base layers designed for high-output activity and extended wear. The U.S. military has issued the Extreme Cold Weather Clothing System with polypropylene base layers. Many soldiers personally prefer merino wool for its odor resistance on multi-day operations.
Can you wear thermal underwear as regular underwear?
Yes, you can wear thermal underwear as your regular underwear in cold weather. They’re designed to be worn next to the skin all day. Many men wear them under work clothes, jeans, or even dress pants in winter. Just avoid wearing them in hot weather, as they’ll cause overheating.
Final Verdict: Which Thermal Underwear Should You Buy?
After three months of testing, the best thermal underwear for men depends on what you’re asking it to do. For pure performance, MERIWOOL’s 100% merino wool base layer pants earned our Editor’s Choice for their combination of genuine merino benefits, machine-washable care, and a price that doesn’t punish your wallet.
If value matters most, Amazon Essentials Waffle Knit Set delivers surprising warmth and comfort at the lowest end of the price spectrum. If you need serious warmth for sub-zero work, the Cuddl Duds Heavyweight is the warmest pair we tested.
Whichever you choose, focus on fit, fabric weight, and intended use over brand hype. A midweight merino or synthetic pair covers most winter situations. Add a heavyweight for genuinely cold days and a lightweight for active use, and you’re ready for anything 2026 throws at you.