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The Best Thermals - 2021

Last updated on November 9, 2021

We looked at the top 7 Thermals and dug through the reviews from 26 of the most popular review sites including and more. The result is a ranking of the best Thermals.

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Our Picks For The Top Thermals

Show Contents
Our Take
Experts Included
Pros
Cons
  Top Pick

Thermajohn Lightweight Tagless Thermals Set

Don't Waste Your Money Seal of Approval

Thermajohn

Lightweight Tagless Thermals Set

Overall Take

Premium FabricThese thermals prevent the spread of odors and wick away moisture.

Experts Included
DWYM Fashion & Apparel Experts plus BestReviews, Balding Beards, Best Reviews Guide, My Pro Scooter, Fighting Report, Sleepopolis and 1 more. Along with user reviews from Amazon and Walmart.
Pros
" Made from a poly-spandex material, the Thermajohn long underwear is decidedly lightweight, stretches easily, and offers full mobility no matter what your activity. It fits snug – almost like a second skin – but is soft."
Cons
"Market is flooded with counterfeits."
  Runner Up

MEETYOO Moisture Wicking Quick Dry Thermals Set

MEETYOO

Moisture Wicking Quick Dry Thermals Set

Overall Take

Light and SlimThese thermals are ideal for outdoor activities.

Experts Included
DWYM Fashion & Apparel Experts plus BestReviews, Sportsman’s Lab, Hunt Peak. Along with user reviews from Amazon and Best Views Reviews.
Pros
" Offers circulation and is made of a breathable material to help keep out body odors. This material is made with a four-pin, six-wire process to help keep the clothing comfortable and to prevent scratching."
Cons
"Unlike most other base layer sets, this one runs large, so buying your standard size or even down one will give a better fit."
  We Also Like

MANCYFIT Breathable Full Length Thermals Set

MANCYFIT

Breathable Full Length Thermals Set

Overall Take

Warm and ComfortableThese thermals are made from polyester and spandex.

Experts Included
DWYM Fashion & Apparel Experts plus BestReviews, Best Reviews Guide, Our Beautiful Planet. Along with user reviews from Amazon.
Pros
" There are over ten colors to choose from and the sizes range from extra small to three X."
  Strong Contender

Indera Waffle Knit Base Layer Thermal Shirt

Indera

Waffle Knit Base Layer Thermal Shirt

Overall Take

Classic FitThis thermal shirt offers a traditional waffle-knit look.

Experts Included
DWYM Fashion & Apparel Experts plus New York Mag. Along with user reviews from Amazon.
Pros
" This one is woven in a raschel knit, which is less bulky than the traditional waffle knit, so it would make a great cold-weather undershirt if you want something a little slimmer with a more body-hugging fit."
Don't just take for granted what one reviewer says. Along with our own experts, DWYM analyzes the top expert reviews of the leading products and generates a score you can actually trust.
14

Products Considered

We identified the majority of the thermals available to purchase.
7

Products Analyzed

We then selected the leading and most popular products for our team to review.

View All Product Rankings

26

Expert Reviews Included

In addition to our expert reviews, we also incorporate feedback and analysis of some of the most respected sources including: WalkJogRun, 40+ Style, Swiss Cycles, BestReviews, Best Reviews Guide.

104,584

User Opinions Analyzed

We also incorporate user reviews from the leading retailers including

Our experts reviewed the top 7 Thermals and also dug through the reviews from 26 of the most popular review sites including and more. The result is a ranking of the best of the best Thermals.

DWYM is your trusted roduct review source. Our team reviews thousands of product reviews from the trusted top experts and combines them into one easy-to-understand score. Learn more.

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Look for the DWYM seal for products that are the best in their category.

The Best Overall

Thermajohn Lightweight Tagless Thermals Set


Our Expert Score

7.6
7 expert reviews

User Summarized Score

9.2
24,772 user reviews

Our Take

These thermals are made of premium fleece fabric that keeps you warm, dry and fresh. They have strong seams that won't rip. The thermals are flexible and stretchy for full mobility.

What other experts liked

Made from a poly-spandex material, the Thermajohn long underwear is decidedly lightweight, stretches easily, and offers full mobility no matter what your activity. It fits snug – almost like a second skin – but is soft.
- Balding Beards
We like these long johns because they’re comfortable and they work well for virtually any cold-weather scenario. There’s no need to find a pair of long johns that you have to change in and out of all the time!
- My Pro Scooter
Featherweight. Designed to be a four-way stretch. Thermajohn's slim fit design has excellent heat retention capabilities.
- Fighting Report
Won’t bunch. Due to the thin nature of the material these underwear are made from, the sleeves won’t bunch up like thicker clothes. This is great for people who like rolling up their sleeves while eating or other activities.
- Sleepopolis
They are excellent for nearly any activity, whether indoors or outdoors. They are incredibly quick to dry, which will keep them from getting musty and damp under your ski pants and jacket. We love how they are incredibly soft and...
- TheSkiGirl

What other experts didn't like

Check sizing carefully – they may run small.
- Balding Beards
Market is flooded with counterfeits.
- Fighting Report
Tight fit. Some may find that the tops of this underwear set fit rather tightly. This is especially true for those with a larger frame.
- Sleepopolis
ome have complained that they can run small, in particular, the legs.
- TheSkiGirl

The Best Bang For Your Buck

MANCYFIT Breathable Full Length Thermals Set

Our Expert Score

7.7
3 expert reviews

User Summarized Score

9.0
4,668 user reviews

Our Take

These thermals are ultra-soft and warm, made from polyester and spandex. The material has four-way stretch and the thermals are available in multiple colors.

What other experts liked

There are over ten colors to choose from and the sizes range from extra small to three X.
- Our Beautiful Planet

Overall Product Rankings

Thermajohn Lightweight Tagless Thermals Set

1. Thermajohn Lightweight Tagless Thermals Set

Overall Score: 8.7
Reviews Included: 9

MEETYOO Moisture Wicking Quick Dry Thermals Set

2. MEETYOO Moisture Wicking Quick Dry Thermals Set

Overall Score: 8.4
Reviews Included: 6

MANCYFIT Breathable Full Length Thermals Set

3. MANCYFIT Breathable Full Length Thermals Set

Overall Score: 8.3
Reviews Included: 4

Indera Waffle Knit Base Layer Thermal Shirt

4. Indera Waffle Knit Base Layer Thermal Shirt

Overall Score: 8.2
Reviews Included: 2

Carhartt Fast Dry Waffle Knit Thermal Pant

5. Carhartt Fast Dry Waffle Knit Thermal Pant

Overall Score: 7.6
Reviews Included: 7

HEROBIKER Breathable Compression Thermals Set

6. HEROBIKER Breathable Compression Thermals Set

Overall Score: 7.2
Reviews Included: 5

Rocky Fleece Lined Moisture Wicking Thermals Set

7. Rocky Fleece Lined Moisture Wicking Thermals Set

Overall Score: 6.9
Reviews Included: 5

Our Thermal Findings


Thermajohn Lightweight Tagless Thermals Set

What We Liked: These thermals are made of premium fleece fabric that keeps you warm, dry and fresh. They have strong seams that won’t rip. The thermals are flexible and stretchy for full mobility.

Simplemost Media


MEETYOO Moisture Wicking Quick Dry Thermals Set

What We Liked: These thermals are made of lightweight fabric and have a slim fit. They are perfect for wearing while engaging in outdoor activities. The thermals absorb sweat so you never feel clammy.


MANCYFIT Breathable Full Length Thermals Set

What We Liked: These thermals are ultra-soft and warm, made from polyester and spandex. The material has four-way stretch and the thermals are available in multiple colors.

Simplemost Media


Indera Waffle Knit Base Layer Thermal Shirt

What We Liked: Get a classic look with this traditional waffle-knit thermal shirt. It is designed to keep you warm in cold to very cold temperatures with a medium activity level. The thermal shirt is machine washable.

Simplemost Media


Carhartt Fast Dry Waffle Knit Thermal Pant

What We Liked: Your skin won’t be irritated in these thermal pants, which are designed with strategically placed seams. The pants have a tagless label for additional comfort. They are made from 100% polyester.

Simplemost Media

Our Thermal Buying Guide

Whether you’re going to spend a day out skiing on the slopes, hiking in the brisk weather or working in the yard, wearing a good pair of thermals underneath your clothes is the key to being comfortable and warm. Thermals not only help your body heat stay at the right temperature, they are also good for wicking away moisture so your body feels dry.

When you’re looking to buy a set of thermals, begin by thinking about the function you want them to provide. For example, if you will be active while wearing the thermals, you may begin to sweat, so find a pair of thermals that is designed to wick away moisture to avoid feeling damp with sweat. Getting thermals that are stretchy is also key if you are going to be active, so that you have a full range of movement in your clothes. If you won’t be able to shower or change clothes frequently, such as when you’re on a hiking trip, then it’s important to find thermals with bacteria-resistance properties.

If you’ll be outside in particularly chilly temperatures, look for thermals that are made from heavy fabrics. Low-density weaves are important for trapping warm air close to your body to keep you toasty and insulated.

Synthetic materials such as polyester, lycra, nylon and spandex are mixed with natural fibers for thermals that can stand up to extremely cold weather. They can also wick away moisture while retaining heat. Thermal underwear that is made of wool is also a great fabric option for moisture-management.

If you’re going to be highly active in moderately cold weather, opt for thermals made from silk, which has a luxurious feel and soft texture. Cotton thermals are an affordable option, but they are not as warm as other fabrics, nor are they as good at wicking away moisture.

DWYM Fun Fact

Thermals are often referred to as “long johns,” but do you know how they got that strange name? The inventor of thermal underwear was John Smedley of Derbyshire. In the 18th century, Smedley had a family-run clothing manufacturing company where they made thermal underwear.

Another John, John L. Sullivan, the boxer known as Boston Strong Boy, later apparently popularized thermals because he always entered the boxing ring wearing only his long underwear.

The Thermal Tips and Advice

  • Getting the perfect fit for your thermals is key. If it’s too tight, it will feel restrictive and it won’t provide a full range of movement. If it’s too loose, you will look bulky with a large layer underneath your clothes. Ideally, thermals should fit like a second skin, so that it insulates your body without having any extra fabric. A snug fit not only looks good under your clothes, it also traps heat that your body generates and doesn’t let it escape. This leaves you feeling warm and toasty in chilly conditions.
  • There are many different types of thermals, such as T-shirts, pants, long-sleeve shirts, briefs and even full-body suits. The type you need will depend on the function you want it to provide. Keep in mind that while one-piece suits are excellent at keeping you warm, they can be difficult to maneuver when you need to use the bathroom.
  • When buying thermals, comfort is of the utmost importance. Opt for thermals that don’t have seams or those with seams that sit completely flat. Because thermals are worn so close to the body, an abrasive seam can cause irritation on your skin if you’re wearing the thermals for an extended period of time.
  • If you haven’t worn thermals before, you may be wondering how they will fit under your pants. The key is to have a lightweight fabric that fits snugly on your body. Pull the thermal waist up above the waistline of your pants so that you can do up your pants with ease.

About The Author

Anam Ahmed 

Anam Ahmed is a copywriter and essayist based in Toronto. She has been writing on technology, travel, parenting, and business for over 10 years, and works with a number of high-profile organizations. She values finding the best products to make people's lives easier. Anam earned an M.A. from the University of Toronto and a B.A.H. from Queen's University. Learn more at www.anamahmed.ca.