Winters can get bitterly cold in several parts of the world and going about your business can be particularly challenging in harsh temperatures. Fortunately, having the best thermal underwear can keep you warm and protect you from the cold. Made from exclusive fabric that is designed to retain the body’s heat, the best thermal underwear is durable and lightweight. So, if you’re interested in finding the best thermal underwear to suit your requirements, this guide can help you pick the right one.

Thermal Underwear FAQ

1. What Is Thermal Underwear?

2. What Are the Types of Thermal Underwear?

3. What Are the Benefits of the Best Thermal Underwear?

4. How to Choose the Best Thermal Underwear?

5. Where Can You Buy the Best Thermal Underwear?

How We Reviewed

In order to help you pick the finest from among the many kinds of thermal underwear available on the market, we invested quite a bit of time and effort to research the different models. We then selected the best thermal underwear and created an unbiased list of the top ten products.

best thermal underwear drawing

What We Reviewed

  • Icebreaker Merino Everyday Midweight Base Layer Leggings
  • Duofold Men's Heavy Weight Double-Layer Thermal Pant
  • Carhartt Men's Base Force Wicking Cotton Super Cold Weather Legging
  • Icebreaker Merino Men's Oasis Long Sleeve Crewe Top
  • Odlo Women's BlackComb Evolution Warm Crew Neck Top
  • Kari Traa Vrang Long Sleeve Baselayer
  • Minus33 Merino Wool Men's Katmai Expedition Bottom
  • FITEXTREME Mens MAXHEAT Compression Performance Long Johns Thermal Underwear
  • Tasc Performance Men's Hybrid Fitted Long Sleeve Tee
  • Columbia Women's Midweight Stretch Long Sleeve Top

Icebreaker Merino Men's Everyday Leggings with Fly, Black, Medium
  • Functioning fly with gusset for ease of movement
  • No center back seam for comfort and layering
  • Flatlock seams prevent chafing

Features

Made entirely from wool and equipped with a functioning fly that also comes with a gusset to facilitate easy movement, these leggings from Icebreaker Merino are among the best thermal underwear for everyday use. They’re also naturally odor-resistant and are made from breathable merino rib fabric. 

Pros

  • Flat lock seams minimize chafing
  • Moisture wicking fabric dries quickly when wet
  • Brushed waistband feels comfortable even under several layers of clothing

Cons

  • The material is sensitive to wear and tear
  • These leggings tend to stretch out over time
  • List Element

Where To Buy

Amazon

Duofold Men's Heavy Weight Double-Layer Thermal Pant
  • Base-layer thermal pant with four-way stretch and chafe-free flatlock seams
  • Drawcord at waistband
  • Tagless

Features

These pants are crafted from a material that is a blend of polyester (96 percent) and spandex bi-polyester (4 percent). They feature flat lock seams that prevent abrasions and come with a drawstring closure mechanism that allows you to adjust the waistband to suit your waist size.

Pros

  • Four-way stretch fabric allows the pants to fit comfortably
  • Double-layer thermals that provide considerable warmth in cold climates
  • Machine-washable fabric that can take quite a few washes easily

Cons

  • The sizing is a bit different from other brands
  • High-waisted design may not be everyone’s favorite kind

Where To Buy

Amazon

Carhartt Men's Base Force Wicking Cotton Super Cold Weather...
  • Moisture-wicking legging featuring logoed-elastic waistband
  • If your inseam length falls between sizes, buy the longer size

Features

Developed in El Salvador using 9.5-ounce, ring-spun knit, 100 percent cotton, these leggings from Carhartt are breathable, snug, and comfortable. The fabric is moisture-wicking and the leggings can be machine-washed frequently. Additionally, they’ve been created in such a way that they fit the legs perfectly, making them ideal thermal underwear.

Pros

  • The use of cotton fabric makes these leggings gentle on sensitive skin
  • Works effectively even in below-zero temperatures
  • Resilient to wear and tear, and can survive through several cycles of machine-washing

Cons

  • The leggings can be a bit too long for some
  • They may be slightly tighter around the ankles

Where To Buy

Amazon

Icebreaker Merino Men's Oasis Long Sleeve Crewe, Gritstone...
  • SOFT & BREATHABLE: The merino jersey fabric of this crew neck tee is so great at regulating your temperature that you'll...
  • BASE LAYERS: Designed to keep you comfortable in hot or cold weather, our odor resistant base layers include wool long...
  • TOP TO TOE LAYERING: Our clothes transcend single usage; we make multi-functional pieces that adapt to your life &...

Features

This base layer long-sleeved top from Icebreaker Merino is made from 100% wool, making it successful at temperature regulation. The fabric is also moisture wicking and dries up quickly, making the top comfortable to wear. It’s also a good choice if you’re planning to go hiking or trekking in cold climates.

Pros

  • Available in nearly 28 colors and patterns
  • The fabric is extremely effective at odor absorption
  • Material doesn’t develop tears or holes even when used roughly and washed frequently

Cons

  • Finding the right fit may be a bit of a problem
  • Fabric may cause a bit of itching on sensitive skin

Where To Buy

Amazon

Odlo Women's BlackComb Evolution Warm Crew Neck Top
  • High Stretch Fabric - Provides a full range of motion.
  • Seamless Knitting Technology - Guards against friction and irritation.
  • Moisture Management - Wicks away excess sweat and moisture.

Features

If you’re looking for thermal underwear that allows your skin to breathe and keeps you sweat-free, this warm crew neck top from Odlo may be just the right choice for you. It’s excellent at moisture management and wicks away any excess sweat or moisture on your skin. Additionally, it also encourages your skin to stay dry by circulating the air.

Pros

  • This top is durable and can be machine-washed in warm or cold water
  • Stretchable nature of the fabric ensures that your movements aren’t restricted
  • Fabric is equipped with a seamless knitting technology

Cons

  • Fabric may eventually stretch out of size over time
  • The tailored fit may be a bit constricting for some people

Where To Buy

Amazon

Kari Traa Vrang Crew Top - Women's (Medium, Greym)
  • The Kari Traa Vrang Long Sleeve Top is a combined; warm wool blend with unrestricted mobility, designed for all types of...
  • The feminine jacquard knit pattern expresses a delicate on-piste design.
  • The Vrang Long Sleeve Baselayer is styled to compliment a womens silhouette, as it feels soft, comfortable and toasty...

Featur​es

​Crafted from a blend that includes warm wool, this long-sleeved base layer from Kari Traa offers unrestricted mobility, exceptional freedom of movement, and dependable protection from cold weather. The top comes in three colors, namely ebony, blush, and gray.

Pros

  • Fabric feels soft and comfortable on the skin
  • Feminine design that features an elegant jacquard knit pattern
  • The fit complements a woman’s silhouette perfectly

Cons

  • The top may be slightly longer than needed for shorter users
  • The fit may be a bit constricting for some people

Where To Buy

Amazon

Minus33 Merino Wool 709 Katmai Men's Expedition Bottom Black XLarge...
  • QUALITY EXPEDITION BASELAYER: 100% Merino Wool super soft and extremely comfortable. The best in easy care technology...
  • CRAFTED TO FIT: Sizes XS to 3XL and Tall Sizes M-Tall to XL-Tall. Minus33 offers a large size selection in a regular...
  • EXPERIENCED BRAND: Although there are many copy-cats on the market today, Minus33 has been a trusted brand since 2004.

Features

Developed from 100% merino wool, this set of bottoms features interlocked knit construction and flatlock seams that ensure there’s no chafing. The fabric is washable and dryable and is long-lasting even when subjected to frequent washes and regular wear and tear.

Pros

  • These bottoms do not suffer from any shrinkage even when washed frequently
  • Stretchy construction ensures that the bottoms fit 
  • Range includes bottoms for sizes starting at extra small and going all the way up to triple-extra-large

Cons

  • Extremely expensive when compared with other options
  • The pants may be a bit short for people who are taller than average

Where To Buy

Amazon

FITEXTREME Mens MAXHEAT Compression Performance Long Johns Thermal...
  • Please pick proper Option you want (Ex. If you need bottom only, please choose bottom only option), Available "One SET...
  • FITEXTREME MAXHEAT Thermal Underwear is Made of Premium Silky Soft Fleece Lining for Excellent Comfort and Warmth in...
  • Four way stretch Compression FITEXTREME Warm Wear is designed for Freedom of Movement and to keep your Body Looking...

Features

This thermal underwear from Fit Extreme is made from a blend of polyester and polyurethane and features a four-way stretch that makes the body look slimmer and ensures that you have ample freedom to move as you please. The fabric also effectively retains heat, wicks sweat, and dries quickly.

Pros

  • Soft fabric is gentle on sensitive skin and doesn’t cause any skin irritation
  • Extremely affordable when compared with other options

Cons

  • The cut of the neck may be slightly wider than expected on some users
  • Finding the right fit can be a bit challenging, particularly if you opt for the entire set

Where To Buy

Amazon

tasc performance men's hybrid fitted long sleeve tee, heather gray,...
  • Wide, supportive waist band with key pocket
  • Gusset at inseam
  • 4-way stretch with no-chafe seams

Features

Made from a functional combination of organic cotton (55 percent), viscose from bamboo (40 percent), and elastane (5 percent), this long-sleeved tee from Tasc Performance has all the features that make good thermal underwear, right from strategic mesh ventilation and a four-way stretch mechanism to being machine-washable and moisture wicking.

Pros

  • Comes with an ultraviolent protection factor of over 50
  • Raglan seams increase the range of motion without irritating sensitive skin
  • Keeps you warm even in sub-zero temperatures

Cons

  • The skinny fit may be uncomfortable for some users
  • The neck and collar regions can be unnaturally tight

Where To Buy

Amazon

Columbia Women's Midweight Stretch Long Sleeve Top, Black, XS
  • 4-way comfort stretch
  • Antimicrobial treatment protects this product from bacterial growth
  • Ergonomic seaming

Features

Made from a combination of polyester (85 percent) and elastane (15 percent), this long-sleeved top for women keeps the body warm and the skin dry, owing to the presence of a thermal reflective lining and a moisture-wicking mesh that allows the fabric to dry quickly.

Pros

  • The fabric has been subjected to antimicrobial treatment, which keeps this garment free from bacterial growth
  • Can be machine-washed, making it easier to maintain
  • Four-way stretch fabric fits the body well and is comfortable to wear for prolonged periods

Cons

  • More expensive than other options for thermal underwear
  • The fit may be a bit loose near the waist

Where To Buy

Amazon

Comparison Table

The Verdict

When it comes to thermal underwear for men, the leggings from Carhartt are undoubtedly the finest among the ten products we selected. They’re affordable, effective at retaining body heat, and allow your skin to breathe. Alternatively, if you’re looking for a complete set of thermal underwear that can help you survive the cold without burning a hole in your wallet, Fit Extreme’s compression wear checks all the right boxes. As for thermal underwear for women, the long-sleeved top from Columbia may just be the right choice.