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Best Thermal Base Layers Reviewed & Rated for Quality

last updated Apr 13, 2019

Thermal base layers provide you with plenty of benefits which are useful when working in cold or windy environments. They keep you warm and protected in such conditions. There are more than enough examples of where dressing in layers is advantageous. Working outdoors is one such example because the weather can fluctuate which means that sometimes we are too cold and other times we are too hot. Dressing in layers helps us deal with the changes in the temperatures because we can add and remove layers as needed. This can be really useful when we work physically also because our body temperatures change as we work hard and then fall when we are resting. To help you find the right pair for your needs, we've compiled a list of the best on the market for your convenience!

In a Hurry? The test winner after 13 hrs of research

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ColdPruf Basic
96.8/100 our score
Materials
98
Fit
95
Comfort
95
Breathability
98
Durability
98
ColdPruf Basic
Why is it better?

This product features True Sizing which helps ensure that it fits as you would expect.

It is extra soft thanks to the blend of cotton and polyester that is spun into yarn.

The seams are flat so that they will not scratch your body.

It has a tagless design so that you won't feel a tag scratch your body.

It is designed to protect you in both cold and extremely cold weather.

In a Hurry? Editors choice:
ColdPruf Basic
Test Winner: ColdPruf Basic
Amazon Link
Researched Sources
14
Researched Sources
Reviews Considered
11250
Reviews Considered
Hours Researching
13
Hours Researching
Products Evaluated
17
Products Evaluated
Sorting Options
Materials Fit Comfort Breathability Durability By Default
Rank
PictureProduct
Name
Rating
Shops
#1
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
96.8
Materials
98 %
Fit
95 %
Comfort
95 %
Breathability
98 %
Durability
98 %
Price Comparison Last Updated (20.11.19)
Amazon Link
$14.80
#2
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
96.6
Materials
97 %
Fit
97 %
Comfort
98 %
Breathability
97 %
Durability
94 %
Price Comparison Last Updated (20.11.19)
Amazon Link
$16.98
#3
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
95
Materials
95 %
Fit
95 %
Comfort
92 %
Breathability
97 %
Durability
96 %
Price Comparison Last Updated (20.11.19)
Amazon Link
$23.99
#4
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94.8
Materials
95 %
Fit
93 %
Comfort
96 %
Breathability
97 %
Durability
93 %
Price Comparison Last Updated (20.11.19)
Amazon Link
$65.00
#5
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94.8
Materials
96 %
Fit
92 %
Comfort
95 %
Breathability
98 %
Durability
93 %
Price Comparison Last Updated (20.11.19)
Amazon Link
$17.99
#6
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
93.2
Materials
93 %
Fit
91 %
Comfort
95 %
Breathability
95 %
Durability
92 %
Price Comparison Last Updated (20.11.19)
Amazon Link
$27.29
#7
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.8
Materials
92 %
Fit
96 %
Comfort
96 %
Breathability
92 %
Durability
88 %
Price Comparison Last Updated (20.11.19)
Amazon Link
$75.99
#8
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.2
Materials
89 %
Fit
93 %
Comfort
92 %
Breathability
93 %
Durability
89 %
Price Comparison Last Updated (20.11.19)
Amazon Link
$16.95
#9
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.6
Materials
90 %
Fit
85 %
Comfort
87 %
Breathability
94 %
Durability
87 %
Price Comparison Last Updated (20.11.19)
Amazon Link
$17.99
#10
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
85.8
Materials
84 %
Fit
90 %
Comfort
80 %
Breathability
95 %
Durability
80 %
Price Comparison Last Updated (20.11.19)
Amazon Link
$15.00

BEST THERMAL BASE LAYERS REVIEWED & RATED FOR QUALITY

1. ColdPruf Basic

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
96.8
ColdPruf Basic
Amazon Link
Materials
98
Fit
95
Comfort
95
Breathability
98
Durability
98
best offer for today
Amazon Link
$14.80
Pros:

This product features True Sizing which helps ensure that it fits as you would expect.

It is extra soft thanks to the blend of cotton and polyester that is spun into yarn.

The seams are flat so that they will not scratch your body.

It has a tagless design so that you won't feel a tag scratch your body.

It is designed to protect you in both cold and extremely cold weather.

Cons:

Some reviewers have mentioned that the stitching doesn't stretch very well which makes it hard to wear.

Other reviewers have reported that the garment feels loose and doesn't fit snuggly.

This brand of a base thermal layer is designed to keep you warm in both cold and extremely cold weather. It is extra soft because it is made out of ring spun yarn. The yarn itself is a blend of cotton and polyester so that it stays both soft and durable. You will also benefit from the flat seams which reduce chafing and scratch.

Accurate Fit

Many brands of thermals do not fit accurately which frustrates many consumers. This brand of thermal features True Sizing so that the size you purchase will fit the way that you expect it too.

Ring Spun Yarn

You should expect the product to feel great while you wear it because it is made out of a ring spun yarn. The fabric is a blend of 60% ring spun cotton that is combed followed by 40% polyester.

Cost and Value

You should expect to pay a price that is below average for this product. It gets its value by having a low cost combined with a durable blend of cotton and polyester.

2. Telsa Wintergear Compression

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
96.6
Telsa Wintergear Compression
Amazon Link
Materials
97
Fit
97
Comfort
98
Breathability
97
Durability
94
best offer for today
Amazon Link
$16.98
Pros:

The garment dries quickly which allows you to feel comfortable after a heavy workout.

It has a micro-fleece lining on the interior so that you can feel comfortable and dry.

The compression fit helps it feel tight and promotes blood circulation and oxygen flow.

You can purchase the product in thirty-seven different colors so you can pick the color that is right for you.

The material has a UPF 50+ rating so that your skin is protected against the sun.

Cons:

Some reviewers have noted that the base layer doesn't block wind very well.

Other reviewers have reported that it loses elasticity after wearing it for a while.

This base layer is a high-performance base layer that is designed with active people completely in mind. It has features that regulate body heat so that you do not feel too hot or cold. The base layers are constructed out of micro-fleece so that it feels soft and comfortable while providing maximum moisture wicking. It has a compression fit that helps promote blood flow and oxygen circulation.

UPF 50+

The base layer is designed to provide you with protection against the sun. This is especially important if we outside on a cold yet highly sunny day. Layers of snow can also reflect the sun which leads to sunburns.

Moisture Wicking

The base layer is designed to provide you with the maximum amount of moisture wicking. It is mostly made out of polyester and it has a microfleece layer on the inner lining that keeps you warm and draws moisture out.

Cost and Value

You will see this layer priced below the average price which turns it into an excellent value. This base layer is highly technology focused and offers lots of features that help you maintain optimal body temperature while outdoors.

3. Carhartt Base Force

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
95
Carhartt Base Force
Amazon Link
Materials
95
Fit
95
Comfort
92
Breathability
97
Durability
96
best offer for today
Amazon Link
$23.99
Pros:

The fabric is made out of 100 percent ring-spun cotton that has a 9.5-ounce weight.

It is fully moisture wicking which will keep you dry while you work.

The thick cotton material helps you stay warm in even extremely cold weather.

You can wash this product in the washing machine when it is soiled or dirty.

The stain breaker technology keeps it looking new because it resists stains from sweat.

Cons:

Some reviewers have felt that this thermal base layer wasn't as warm as they expected.

Other reviewers have reported that the product feels rough and stiff.

Carhartt brand products are known for high performance in the coldest conditions. This base layer is made completely out of cotton so that it feels warm and is moisture wicking. This allows you to feel great while you work hard. The cotton has a soft feel on the skin yet it traps heat and removes moisture away from your skin so that you won't feel cold or sweaty.

Durable

The garment is made out of high quality and thick cotton that is ring spun. The seams are reinforced so that it won't tear around the seams. The 9.5-ounce cotton resists tears and abrasions caused by hard work.

Stain Breaker

This base layer will continue to look new for a long time thanks to its stain breaker technology. Sweat and other liquids can stain your base layer which can make it look old and worn out but that won't be the case with this product.

Cost and Value

You should expect to pay a price that is well above the average for this thermal base layer. The product gets its value by being made out of thick and heavy-duty cotton that is long lasting and resists tearing.

4. Duofold Double Layer Union

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94.8
Duofold Double Layer Union
Amazon Link
Materials
95
Fit
93
Comfort
96
Breathability
97
Durability
93
best offer for today
Amazon Link
$65.00
Pros:

This suit is made out of a Merino wool blend fabric to help you stay toasty warm.

The inner layer of the suit is made completely out of cotton so it feels great.

It has seams that help resist chaffing so that you won't feel uncomfortable while moving.

The suit is a midweight fabric and will fit well underneath other clothing.

You can easily put the suit on because it has a button up front opening.

Cons:

Some reviewers have noted that the suit shrunk after washing it so order it larger than normal.

Other reviewers have reported that the sizing chart isn't accurate so its hard to buy the right size.

This base layer is a coverall style that encloses your entire body in a warm base layer. It features dual layers of fabrics so that you feel both warm and comfortable. The suit buttons up from the crotch to your neck and it has full pant legs and sleeves so that your body is completely covered and protected. You wash this suit in the washing machine when it is soiled.

Merino Wool

Merino sheep are an animal that is native to New Zealand and is known for their extremely warm wool. The wool can insulate up to -20 degree Fahrenheit. This suit is made from a fabric blend that includes 25 percent, Merino Wool.

Cotton Layer

The inner layer of the suit is made entirely out of cotton. The cotton fabric serves the dual purpose of insulating your body and feeling soft. The softness of cotton makes this suit extremely comfortable to wear.

Cost and Value

This suit has a price that is higher than average but it is an excellent value because it covers your entire body. It is made out of high-quality materials such as Merino wool and cotton and offers full body protection.

5. Hanes Red Label

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94.8
Hanes Red Label
Amazon Link
Materials
96
Fit
92
Comfort
95
Breathability
98
Durability
93
best offer for today
Amazon Link
$17.99
Pros:

The fabric is made out of a blend of 60% cotton and 40% polyester.

It has a snug fit thanks to the waffle fabric which also feels great.

The garment resists shrinking from washing and drying it between uses.

The seams are flat and will not rub against your skin for extra comfort.

There are no tags and the product so you will get scratches from tags.

Cons:

Reviewers have reported that the product is not as warm as what they expected.

Other reviewers have mentioned that the size is not accurate and it doesn't fit correctly.

These thermals are a great choice for general usage. They are made out of a waffle fabric that is extra soft and feels great. It naturally wicks away moisture so that you won't feel cold and sweaty while wearing it. The seams are flat and have no-rub stitching so that you won't get chaffed at the seams. You can also wear these for a long time since they resist shrinking.

Shrinkage Controlled

Many brands of thermals end up shrinking after they have been worn and washed a few times. This brand of thermals addresses that problem by offering shrinkage control which helps them maintain their size after many washes and wears.

Waffel Fabric

You will find this garment to be really comfortable to wear thanks to the waffle fabric. The fabric has a snug fit so that it won't get caught against other items while you wear this base layer.

Cost and Value

The product has a price that is below the average when compared to the other thermal base layers. It has an excellent value because it is low cost and yet is still warm and comfortable.

6. Ekouaer

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
93.2
Ekouaer
Amazon Link
Materials
93
Fit
91
Comfort
95
Breathability
95
Durability
92
best offer for today
Amazon Link
$27.29
Pros:

This thermal base layer set is made out of 95% cotton and 5% elastane material to make it feel great.

The shirt features a tagless design so that you will not feel a tag scratch against your skin.

The bottom layer has an elastic waistband so that the bottoms are held up where they belong.

The base layer set is dual-layered so that you have added insulation and stay warm.

There is fleece lining on the leg sleeves so that the legs are further insulated from the cold.

Cons:

Some reviewers have reported that the bottoms bunch up in the crotch area.

Other reviewers have mentioned that the size does not appear to be accurate which leads to an odd fit.

This base layer set allows you to feel warm and comfortable while you are enjoying the cool or cold outdoor weather. It is made out of soft cotton fabric and is lined with fleece which feels great on your skin. The material is nice and warm and even wicks away moisture so that you feel completely and totally comfortable and pampered while you are wearing this laying set underneath your winter clothes.

Soft

This brand of the thermal base layer is doubled layers and is made from 95% cotton fabric. Cotton has an extra soft feel on your skin and when combined with the fleece lining found on the legs, you will feel great.

Moisture Wicking

The base layer is made from a material that is naturally moisture wicking material. This allows any perspiration from your skin to evaporate naturally away from your body so that you do not end up feeling sweaty while wearing this base layer.

Cost and Value

You should plan on spending a price that is slightly higher than the average price for thermal base layers. The extra price comes from the fact that this base layer is extra soft, doubled layers, and extra warm for the winter.

7. Minus33 Merino Wool Kancamagus

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92.8
Minus33 Merino Wool Kancamagus
Amazon Link
Materials
92
Fit
96
Comfort
96
Breathability
92
Durability
88
best offer for today
Amazon Link
$75.99
Pros:

This base layer is made completely out of merino wool so that it is warm and comfortable.

The material has a stretch fit so that it fits snugly against your body and does catch.

You can wash this item in the washing machine and dry it in the dryer.

It is naturally moisture wicking so that you won't feel hot and sweaty while wearing it.

There are no tags on this base layer so you won't get scratched by tags.

Cons:

Some reviewers have experienced holes forming throughout the garment after washing it.

Other reviewers have reported that the elastic bands on the waist and cuffs get loose after a while.

This base layer is an excellent choice if you are going to be in extremely cold weather. It is made completely out of Merino wool, which is one of the best natural materials for insulating against the cold weather. This base layer is naturally moisture wicking, has a tagless design, and flatlock seams. These features make it comfortable to wear because you won't feel sweaty or getting scratched by tags or seams.

Merino Wool

The product is made completely out of merino wool. The wool has many features such as being a great cold weather insulator. It is also naturally wicking and it resists fires. This makes it a great material for a base layer.

Anti-Microbial

The base layer is anti-microbial which helps it stay clean. The material naturally resists odors and fungus which prevents it from smelling bad. This makes it a great base layer to wear if you are engaging in physical activity.

Cost and Value

You should expect to pay a high price for this premium product. The price comes from the fact that the base layer is made completely out of Merino wool. Most other base layers use a wool blend to keep the price down.

8. Fitextreme FX MaxHeat

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91.2
Fitextreme FX MaxHeat
Amazon Link
Materials
89
Fit
93
Comfort
92
Breathability
93
Durability
89
best offer for today
Amazon Link
$16.95
Pros:

It uses a compression fabric which allows for plenty of movement while keeping your body shape.

There is a fleece lining that provides you with excellent comfort and warmth in the cold weather.

This base layer is lightweight which makes it great for sports or active activities.

The material used to make this base layer dries quickly and is moisture wicking.

It is made from a blend of polyester and polyurethane so it feels soft on your skin.

Cons:

Some reviewers have reported that they are not as durable as what they expected them to be.

Other reviewers have mentioned that the material is too thin and doesn't retain heat very well.

If you are someone who enjoys looking your best, then you will want to check out this compression fit base layer. It is made from a stretch fabric which shapes your body so that you have the absolute best look. The thermal layer is great for outdoor activity since it retains heat while wicking away any moisture that you may develop while you are active.

Compression Fit

This base layer is made from a compression fit fabric that stretches in four different directions. Many athletes love compression fit because it promotes additional blood flow throughout your body and allows for better performance while you are active.

Polyester and Polyurethane Blend

The material used to make this base layer is a blend of 93 percent polyester and 7 percent polyurethane. This allows the base layer to breath well, wick away moisture, while it retains your body heat and keeps you warm.

Cost and Value

You should plan on seeing this base layer sold at a price that is higher than the average price for a thermal base layer. The higher cost is reflected by the higher quality materials which shape, stretch, and keep you warm.

9. Moet Fashion Long Johns

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.6
Moet Fashion Long Johns
Amazon Link
Materials
90
Fit
85
Comfort
87
Breathability
94
Durability
87
best offer for today
Amazon Link
$17.99
Pros:

The thermal layer is dual-layered and has a fleece lining on this inner layer.

It is made out of a blend of polyester and spandex so that it feels extra soft.

The material has a four-way stretch so that the thermal base fits snuggly on your body.

It is sold in five different colors so that you pick the one that feels best.

The fabric is highly breathable and wicks away moisture so that you stay dry.

Cons:

Some reviewers have said that the thermal layer feels too tight and is hard to wear.

Other reviewers have had issues the seams tearing or ripping.

If you are planning on being active while outdoors, then you may want to consider these thermal long johns. They are made out of a blend of polyester and spandex so that they fit great while providing plenty of moisture wicking. The inner layer features a fleece lining so that it feels great against your skin and makes it a pleasure to wear.

Polyester and Spandex

The thermal is designed to feel ultra soft because it is made out of a blend of 92% polyester with 8% spandex. The material also has the benefit of being long lasting and holding its shape.

Fleece Lining

The inside of the thermal features a fleece lining. It has the benefit of feeling soft and wicking moisture. You will continue to feel both dry and warm while wearing this thermal layer.

Cost and Value

You should expect to see these long johns sold at an average price. They have a great value because they are extra soft and will make you feel extremely comfortable. They fit great and are extra comfortable.

10. Fruit of the Loom Classics

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
85.8
Fruit of the Loom Classics
Amazon Link
Materials
84
Fit
90
Comfort
80
Breathability
95
Durability
80
best offer for today
Amazon Link
$15.00
Pros:

The fabric is a blend of polyester and cotton which is both long lasting and durable.

You can wash this thermal in the washing machine and dry it in the dryer as needed.

The material is moisture wicking which will help you stay warm and dry.

The waffle fabric stretches with your body and provides a warm and snug fit.

They have a low enough of a cost that allows you to purchase plenty of garments.

Cons:

Some reviewers have mentioned that the fabric doesn't maintain its elasticity.

Other reviewers have reported that the fabric feels very rough and isn't very comfortable.

These thermals are meant for general usage and will keep you warm in a variety of cooler and cold environments. The material is highly breathable so that you will benefit from moisture wicking. The fabric is a blend of polyester and cotton and has a waffle construction so that they feel soft and warm. You can wash these thermal in the washing machine when they get soiled and dry them in the dryer.

Waffle Fabric

These thermals feature a waffle fabric that is a blend of polyester and cotton. The result is a thermal base layer that fits snugly against your body while keeping you both warm and dry.

Durable Construction

The polyester helps the thermals resist forming holes, tearing, and shrinking. The seams have a flatlock construction that is smooth and will resist tearing or ripping. This results in a long lasting pair of thermals.

Cost and Value

You can purchase these thermals at a rock bottom price which makes them a great value. They are priced low enough that you can easily purchase enough pairs to have one for every day of the week.

Criteria Used for Evaluation

Materials

There are two main factors that determine how warm a thermal base layer will feel. One factor is the material used to make the clothing and the other factor is the thickness of your base layer. Some materials are better suited for keeping you warm in cool weather. You should expect that thermal base layers that are mostly made from synthetic materials are meant for cool weather. This includes materials such as spandex, nylon, or polyester, or any other polymer based fabric.

Natural fibers tend to do a much better job of keeping you warm as opposed to synthetic fibers. The reason is that natural fibers have long strands that can trap more air than shorter strand synthetic fibers. They also retain moisture and use moisture as a way to block airflow and insulate your body better. The most popular natural fiber used in thermal base layer clothing is cotton because cotton insulates well and feels soft against your skin. It is also possible that you may see wool used in this type of clothing as well because wool insulates better as it gets wet.

However, the material isn’t the factor that determines how warm a thermal base layer will feel. You will also need to consider how thick the material is as well. Some thermal base layers are made from thin materials which are better suited for cooler but not cold weather.

Fit

When you are picking out a thermal base layer, you should make sure that it fits correctly. There are a few different trouble areas that you will need to check when you are trying on a pair of long johns. You should check the sleeves, legs, waistband, shirt, and how tight the base layer is on your body.

The base layer should maintain a proper fit throughout the entire day so it should not stretch out as you move around in it. A base layer that does not fit properly can become distracting and annoying which will cause you to feel dissatisfied with your purchase. The better your base layer fits on your body, the happier you will be with the base layer and the more likely you will want to wear it.

Many people struggle to find a base layer that fits them properly. When you are looking for a set of thermal base layers, you will need to check that both the pants and the shirt fit properly. The shirt should feel snug on your body but it should not feel constricting either. You should be able to move freely while you are wearing the shirt without having it feel as if you are going to bust out of it.

The same rules hold true for the pants. Once again, you want to make sure that the pants are not too loose or too tight. The pants should allow you to move your legs freely without feeling as if the seems are going to break. You will want to make sure that you can bend your knees and touch your toes without the pants falling down and exposing a plumber’s crack. The leg sleeves on the pants should be long enough to reach your ankles when you are standing up straight and when you are sitting down.

Comfort

When you have found the right pair of thermal base layer clothing, you should feel as if you are not wearing the base layer in the first place. That means that comfort should be a high priority when you are shopping for the best pair of a thermal base layer. Your base layer should feel great against your skin.

It should not itch, scratch, or give you a rash. There should be no chafing as you are moving around nor should you feel as if it is pulling your body hair out of your body. Thermal base layers should feel cozy and comfortable and the better job you do at making sure of this, the better you will feel while you are wearing a pair of long johns.

Breathability

Wearing a thermal base layer with your clothing should not make you feel hot and sweaty. You should instead feel warm, cozy, and dry which means that your base layer should be able to breathe and wick away moisture. The last thing you want is to feel as if you are inside of a sauna or a steam room while you have your long johns on. The better job a thermal base layer does with keeping you dry, the more comfortable you will feel while you are wearing it. Therefore, moisture wicking is an important factor when you are picking out a pair of a thermal base layer.

Durability

You should check that is made from a material that can resist tearing and abrasions from both wearing the base layer and washing it. The stitching should also be strong enough so that you do not end up popping seams as you use the clothing. You should also expect that it can maintain its elasticity throughout its life so that it continues to fit properly as you wear the base layer and take it off. Higher quality thermal base layers tend to be a better value since you do not need to replace them as often as an inferior product.

Expert Interviews & Opinions

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expert tips icon
Stay Warm With Layers

One way we can dress in layers is to wear a thermal base layer. This is essentially long underwear that covers our legs, torso, or both depending on what we purchase. Thermal base layers are great because they are lightweight but still hug our bodies. They help us stay warm by trapping our body heat. We can use these layers to help us stay warm in especially cold or windy environments. Thermal base layers are lightweight and can help protect us against the cold.

Benefits Of Thermal Layers

These layers are highly ideal for work or physical activity because they are tight fitting which means they won’t get caught on other objects. Your exterior clothing slides over the top of this layer so it doesn’t bind to a pair of blue jeans or other forms of pants. Often times, the base layer has the benefit of compressing our muscles so that lactic acid is removed more quickly thanks to promoted blood flow. Most thermal base layers are moisture wicking is that they help your body quickly remove moisture from sweat. This helps regulate your body temperature and prevents you from developing conditions such as skin rashes.

Control Your Body Temp

Having a base layer is a great way to help you feel great while you are outside. There are plenty of situations where we need to dress in layers. Having a thermal base layer allows you to remove your jacket for brief periods of time while you feel too hot. They will help your body maintain its core temperature and protect you against cold blasts of wind. If you start to feel too cold, you can easily add layers over the top of your base layer since it is very thin.

Frequently Asked Questions

q: What is a thermal base layer?

a:

A thermal base layer is a piece of thin clothing that is meant to be worn as undergarments to your regular clothing. They cover your entire body and help retain body heat which makes them great for cool and cold weather. Since thermal base layers are meant to be thin, they allow you to wear your regular clothing over the top of them which makes it possible to dress in layers. Dressing in layers is a great way to stay warm.

q: How do I keep my thermal base layer from smelling bad?

a:

You can reduce the odor in your thermal base layer by making sure they are moisture wicking and anti-bacterial. Thermal base layers that retain a lot of moisture will retain your body sweat and promote the growth of bacteria. The combination of sweat and bacteria will produce an odor which will cause your clothing to smell. The best way to address is the issue of smell is to eliminate the cause of the smell in the first place.

q: What is a merino wool base layer?

a:

Merino wool comes from a type of sheep that is from New Zealand. The wool is known for its ability to insulate well in even the coldest weather which makes it a great choice for thermal base layers. You will most likely see thermal base layers that are made from a blend of wool and another fabric since wool can feel itchy, but such base layers are considered to be the warmest out of thermal base layers.

q: What are the differences in weight of thermal base layers?

a:

You can find thermal base layers in lightweight, midweight, and heavyweight. Lightweight base layers are meant for cool weather that is above freezing temperatures. You can use midweight base layers when you are in cold but not the extreme cold weather. Heavyweight base layers are the thickest and are meant for the extreme cold weather. You typically wear heavyweight base layers over the top of a lighter weight thermal base layer so that you have an additional layer.

q: What are insulating thermal base layers?

a:

Insulating thermal base layers are base layers that are made from a material that traps air and creates a thermal barrier. Such thermal base layers either use an insulating material such as wool and may be made out of multiple layers for additional insulation. You should use insulating thermal base layers when you are in cold or extremely cold weather as this type of clothing will help you retain the most body heat in such weather.

Sources

  1. Wes Siler, Gizmodo, Lifestyle Site
  2. Editorial Team, REI, Outdoor Site