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Best Men's Base Layers and Thermal Underwear for 2024

We analyzed top picks from leading reviewers to find the best for every need

By ShopSavvy Team

Published: May 16th, 2024

❄️Staying warm in the winter starts with picking the right base layer. Whether you're gearing up for a winter hike, hitting the slopes, or just need some extra warmth during your day-to-day activities, finding the right base layer is crucial.

We've dug into the details and reviews to pull together a list of the best men's base layers and thermal underwear that'll keep you comfortable throughout 2024.

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Overall Best: Smartwool Classic Thermal Merino 1/4 Zip

Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip Large Black

Our top pick, the Smartwool Classic Thermal Merino 1/4 Zip, effortlessly balances warmth, breathability, and comfort. Crafted from 100% merino wool, this midweight base layer excels at heat retention while still being breathable enough for various cold-weather activities. One of its standout features is the natural odor-resistance of merino wool, which keeps you feeling fresh even after long wear. The seamless construction ensures itch-free comfort, reducing chafing, and the quarter-zip design allows for easy temperature regulation. Whether you're layering up for skiing or wearing it on a chilly day out, this piece is versatile and reliable.

Lowest at any Popular Retailer

$119.00 at Amazon

More Answers

Still curious about the Smartwool Men's Merino Base Layer 1/4 Zip? Here are some answers you might find interesting:

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How warm is the Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip?

If you're curious about the warmth of the Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip, it’s built from 100% merino wool, which is known for being cozy in cooler climates. In the manufacturer's product description, it's highlighted as versatile, so it's great whether you're skiing, hiking, climbing, or biking in chilly weather. Our research points out that this base layer does a great job of keeping you dry by wicking away moisture, which helps prevent feeling overheated or damp when you're active. It’s especially useful because, as we know, being too warm or damp can really ruin a day out. It's also designed for comfort, with nice touches like shoulder panels that ditch annoying seams and flatlock seams to cut down on chafing—all things that make wearing it for long periods much more pleasant. While we couldn’t find direct user reviews, professional critiques are really positive. They often highlight the warmth, breathability, and the soft feel of the merino wool. It sounds like a solid choice if you're looking for reliable warmth and comfort. Some folks noted that it's not the cheapest option, but they also mentioned its durability and performance as strengths, so it seems like it offers good long-term value. Plus, the merino wool is naturally odor-resistant, which means you can wear it more times in between washes without worrying about smells. So if you're after warmth and flexibility in a base layer, the Smartwool option seems worth considering. It's not just about staying warm—it’s also about feeling comfortable and keeping up with your activities.

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How does the Smartwool Classic Thermal Merino Base Layer 1/4 Zip fit?

The Smartwool Classic Thermal Merino Base Layer 1/4 Zip seems to be a hit among folks who love getting out there in the cold. From what we've found, it's made entirely out of Merino wool, which does a great job at keeping you warm and dry. The quarter-zip is a nice touch too, letting you regulate your temperature when you're hiking or skiing. It seems to fit snugly, but not so tight that you lose any flexibility. So whether you're stretching, climbing, or skiing, you shouldn't feel restricted. The material does a solid job of balancing temperature and wicking moisture, which helps keep things comfy in different kinds of weather. People often talk about how soft and warm the Merino wool feels, plus it deals with odors nicely—something super handy if you wear it multiple days in a row before washing. According to what we found, some experts like Nick Mott from [Switchback Travel](https://www.shopsavvy.com/redirect?url=https%3A%2F%2Fwww.amazon.com%2Fs%3Fk%3DSwitchback%2BTravel%26tag%3Dssw.ans.tx-1-20) and Katie "Oats" Houston from [The Trek](https://www.shopsavvy.com/redirect?url=https%3A%2F%2Fwww.amazon.com%2Fs%3Fk%3DThe%2BTrek%26tag%3Dssw.ans.tx-1-20) really praise its breathability and ability to manage heat. One thing to keep in mind is the price. It's on the higher side compared to some other options out there. But this cost reflects the quality and sturdy build, which should last you a while and makes it worth considering if you're regularly out in the cold and need reliable gear. Overall, if you're after a warm, comfortable, and odor-resistant base layer, this one from Smartwool seems like a solid pick. Sure, it might take a bigger chunk out of your wallet, but given its benefits and quality, many find it a valuable piece for their outdoor adventures.

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Is the Smartwool Classic Thermal Merino Base Layer 1/4 Zip good for high-intensity activities?

If you're looking into the Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip for activities like skiing, it seems like a solid choice. It's made from 100% merino wool, which is great for dealing with cold weather while keeping you comfy. One great thing about merino wool is how it naturally manages your body temperature. It'll keep you warm when it's chilly, but it's also breathable enough so you don't overheat during those intense moments. The 1/4 zip feature is a nice touch, making it easy to cool down when you're heating up. It's pretty handy for those quick adjustments, especially if you're out tackling a steep slope. Comfort-wise, this base layer seems to do well. According to our research, the flatlock seams are designed to minimize chafing, so you can wear it comfortably for long periods—perfect if you're spending a full day out in the snow. People seem to really like the durability and comfort of this base layer. Our research highlights its soft fabric, effective moisture-wicking, and odor resistance, which are all pretty crucial for keeping fresh on multi-day skiing trips. On the flip side, it does come with a higher price tag, so that's something to keep in mind if budget is important. All in all, if you're after a base layer that offers warmth, comfort, and versatility, the Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip could be a good fit for skiing and other demanding cold-weather activities.

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Runner-up: Ibex Woolies Tech Long Sleeve Crew

The Ibex Woolies Tech Long Sleeve Crew is our runner-up, known for its superior blend of durability, comfort, and moisture-wicking properties. This midweight merino wool base layer is perfect for both high-intensity and casual activities. It offers excellent odor resistance and breathability, ensuring you stay dry and comfortable all day long. The snug, form-fitting design not only retains heat but also layers easily under other clothing. While its price may be a bit steep, the performance and quality make it a worthy investment.

Lowest at any Popular Retailer

$115.00 at Amazon

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Budget Pick: REI Co-op Lightweight Base Layer Crew

If you're on a budget but don't want to compromise on quality, the REI Co-op Lightweight Base Layer Crew is an excellent choice. Made from a blend of polyester and spandex, this lightweight base layer delivers on comfort and functionality. Its moisture-wicking capabilities and quick-drying nature make it suitable for various activities. Although it doesn't offer the same warmth as merino wool options, it's perfectly adequate for everyday use or light physical activities. The affordability combined with its performance makes it a solid pick for budget-conscious shoppers.

Available at Amazon

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Best for High-Output Activities: Smartwool Intraknit Thermal Merino Crew

For those who engage in high-output activities like skiing or intense hiking, the Smartwool Intraknit Thermal Merino Crew is tailored for performance. This midweight base layer features a blend of merino wool and synthetic fibers, enhancing durability and moisture management. The seamless knitting technology targets insulation and breathability exactly where you need it, ensuring ultimate comfort during demanding activities. Its snug fit and technical design not only look great but ensure you stay warm and dry, making it an ideal choice for active users.

Lowest at any Popular Retailer

$90.95 at Amazon

Best Heavyweight Base Layer: Arc'teryx Rho Heavyweight Zip Neck

Arc'teryx Rho Heavyweight Zip Neck Men's | Warm Polartec Stretch Fleece Base Layer Large Black

When facing extremely cold conditions, the Arc'teryx Rho Heavyweight Zip Neck stands out as the best heavyweight base layer. This base layer is made from a mix of polyester, nylon, and elastane, offering exceptional warmth and effective moisture-wicking properties. The close, cozy fit maximizes heat retention, while the zip neck lets you adjust for ventilation as needed. Although priced higher than most, its performance in frigid temperatures is unmatched, justifying the investment for those who need top-tier protection against the cold.

Lowest at any Popular Retailer

$140.00 at Amazon

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