Top 8 Best Thermal Underwear 2017 Reviews - Rifles HQ

Top 8 Warmest Thermal Underwear On The Market Right Now

good quality thermal clothing on Alaska hunting

There are a thousand and one ways one can improve his health, and the least way we probably think of is through what we wear. However, it has been proven that getting the best thermal underwear has a way of improving heart function and can also boost your health status generally.

This is so because maintaining a normal body temperature without any significant drop or raise plays a crucial role in boosting immune system, heart function, and blood circulation.

Since there are a bunch of brands that specialize in producing thermal clothing, getting the best thermal underwear for extreme cold may be somewhat daunting in 2018. Getting the best out of anything requires proper information and guidance. In this article, we shall be taking you through a comprehensive guide on the things you need to know and consider before buying thermal underwear.

Why Do You Need Warm Thermals?

Often times, we consider thermal underwear as luxury items. Majority of people believe that during winter, the best possible way to stay warm is through layering which can be achieved by putting on 3 shirts, 2 sweaters and a parka.

The aim of thermals underwear is to drastically reduce these extensive padding. Below are some of the reasons why you need thermal underwear:

  • Thermals underwear are tightly and closely knitted to help retain body heat
  • Majority of these clothing are designed to control body odors
  • Some have the capacity to wick moisture(sweat), which helps to keep the skin dry
  • Some brands are made with unique materials like wool or synthetic fabrics that act as an insulator and make the garment breathable

Things To Consider When Buying Good Quality Thermals

The most essential and critical factor to consider in thermal underwear is how best they handle moisture. Sweating is the major disadvantage of conventional layering – when you sweat profusely, the body loses much heat through evaporative cooling. When this occurs, body temperature drops as a result of sweat evaporation. This is the last thing you’d want during cold seasons.

Having said that, let us look at some important factors to consider before making a purchase.

Durability & Care

The reason behind getting the best thermals is for them to last. There are some reputable brands that can last over hundred washes and still remain intact for many years, so long proper care are giving to them. It is great to adhere to the manufacturer’s instructions on how to wash thermal underwear, but these few tricks below will help tremendously:

  • Avoid washing with different colors of garments to prevent color bleeding
  • Majority of the brands are compatible with machine washing. Stick to the manufacturer’s manual, but the general rule is that underwear will shrink when washed with hot water
  • In most cases, hand washing will not properly take care of odors
  • Use line drying to prevent shrinkage
  • Fabric softeners, bleach, or any other specialty cleaners are not suitable for most thermal underwear. Fabric softeners will disrupt the fabric’s wicking property, and bleach will weaken the tightly knitted fibers. A mild detergent is the best option to use.
  • Avoid washing with the zippers zipped up to prevent wear and tear
  • Since merino wool controls odor very well, less washing may be required

Types Of Thermal Underwear

Majority of the thermal underwears are made from any of these four main fabrics:

Cotton fabric

Thermal underwear made with cotton material are less expensive. These underwear are best used for keeping warm around your home or attending events that requires little physical activity, since it kind of retain moisture as you sweat.

Synthetic fabric

Underwear with this fabric type are specially designed for cold weathers. They are usually a combination of polyester, nylon, spandex, and other synthetic materials. Majority of them helps to balance moisture wicking & heat retention.

Another nice synthetic fabric to get in the market is polypropylene. It is durable, wicks moisture, and retains heat while wet. It is less expensive and also dries fast.

Silk fabric

Majority of the thermal underwears made from silk are treated with chemicals to enhance their ability to wick moisture. When compared to the synthetic underwear, silk has a slower rate of wicking moisture, but the soft feel you get from silk can’t be beaten. It also fits perfectly as underwear because of its very thin nature.

Wool Fabric

If you are looking for a more natural thermal underwear, this fabric will serve you better. It wicks moisture and retains it on its own. It is what the military and hunters use way back in the early beginnings. However, it may be sometimes irritating to the skin.

Among the different types of wool, merino is one of the most popular. Unlike the traditional wool, merino doesn’t collect odor or itch. It also retains heat even when it’s wet.

Apart from the fabric type, there is more to lookout for when choosing good quality thermals – getting the right fabric weight makes you comfortable at all times.

8 Best Rated Warmest Thermal Underwear To Buy in 2018

Duofold Men’s Mid-Weight Thermal Pant

Duofold is one of the best thermal pants, that’s available in the 2018 market. It is made from 60 percent cotton and 40 percent polyester. This base-layer bottom is suitable for everyday use to keep the body warm especially during little physical activities. The soft texture knit traps air between 2 thermal layers to keep you warm and comfortable.

It has an elastic waist that wicks moisture for more comfort. Duofold underwear pants are very close to the body which makes it convenient to use. It is best to wash with machine and mild soap


  • Made from great fabrics
  • Keeps you warm and comfortable
  • It fits nicely
  • It’s not bulky


  • Not suitable for strong physical activities
  • Not long enough (reaches ankle level)

Fruit of the Loom Men’s Thermals

The Fruit of the Loom Thermal Bottoms is one of the world’s oldest brands of thermals that was born in 1851 by two brothers Benjamin and Robert Knight. It is a great thermal underwear that delivers warmth in outdoors, and gives cool comfort while indoors. It is made of 60 percent cotton and 40 percent polyester which makes it strong and durable.

The mid-weight cotton waffle fabric does great in wicking away moisture to keep you cool and comfortable, stretches well, retains heat when needed, and offers a comfortable fit. There is a touch of spandex on the ribbed cuffs to make it stay snug on your ankle, and a tag-free elastic waistband for itch-free comfort.


  • Made of high quality fabric
  • Sturdy and durable construction
  • Retains heat when needed
  • Keeps you cool and comfortable
  • Has a nice design


  • It’s quite long, thus suitable for tall people
  • Too much space in the crotch and not enough at the back

Rocky Women’s Thermals

This is a nice choice of thermal underwear for women made for the cold weathers. This 2pc thermal underwear set is made of high grade materials (55 percent cotton and 45 percent polyester) that makes it strong and durable. This high quality underwear is suitable for use as athletic wear and as sleepwear.

It has a smooth knit for comfortable feel and doesn’t shrink, which makes it retain its perfect shape and size. Other amazing features of this underwear is that it has an elastic waistband that’s heat-resistant and thermal knit that retains body heat to keep you warm.


  • Made of quality material
  • Strong and durable
  • Keeps you warm and comfortable
  • Doesn’t shrink after washing
  • Beautiful and soft


  • It’s quite too small
  • The seams are not firm enough

FX Men’s MAXHEAT Long Johns Thermals

FX Men’s MAXHEAT Long Johns Thermal underwear is one of the warmest long johns one can get from the market. It is made of 93 percent polyester with a blend of 7 percent polyurethane for strength and durability. This amazing underwear is lined with silky soft fleece for great comfort and warmth during cold weathers.

It has a four-way stretch compression design that provides room for free movement and to maintain a slimmer body shape. This underwear is light weight, has an excellent retention power, wicks away sweat and dries quickly. You can either buy the full outfit (top & bottom), top only, or bottom only.


  • Made from high quality fabric
  • Offers great comfort and warmth
  • Provides free movement and slimmer body shape
  • Has an excellent retention property
  • Wicks away sweat easily
  • It is light weight
  • Dries fast


  • Has little issue with sizing. You will need to up your size
  • Not tight enough to retain heat 100 percent

Women’s Thermal Underwear 

If you are a woman that is looking for the warmest long underwear that will serve you in cold weathers, this women’s thermal underwear lined with fleece is what you need. It is light weight, but keeps you warm in cold weathers. It is ultra-soft, warm and comfortable to use.

This underwear is ideal for home use and adds an extra layer of warmth beneath your clothes. It comes in different colors, thus giving you the leverage to choose your favorite colors. Its package include a 2-pc fleece line thermal underwear (top and bottom).


  • Made of nice fabric
  • Keeps you warm and comfortable
  • It is light weight
  • Comes in different colors
  • Fits perfectly


  • Has sizing issues
  • Seams are not firm enough
  • May shrink after some time

Carhartt Men’s Cold Weather Legging

Carhartt Base Force Cold Weather Legging is one of the best long johns to wear in cold weathers. It does a great job in shielding cold, thanks to its tightness to the body. It weighs just 9.5 ounce, and made of 100 percent cotton with ring-spun knit. It is soft, warm and comfortable to wear. It has a high wicking power and keeps you dry always. This amazing thermal underwear has a technological impact that makes stains go off easily during washing.


  • Made from 100 percent cotton
  • Soft, warm and comfortable to wear
  • Gives a perfect fit
  • Wicks away moisture easily
  • Dries faster
  • Stains go off easily in the wash


  • Sizing is not accurate. You will need to up it
  • Doesn’t produce enough warmth in extremely cold weather

At The Buzzer Long Thermal Underwear For Men

As a man, if you seek for the best long underwear to use in extremely cold weather, At The Buzzer Thermal Underwear will serve greatly. It is made of 60 percent cotton and 40 percent polyester that makes you feel warm and comfortable. It is sturdy and durable, and not bulky at all. The elastic waistband adds extra comfort and perfect fitting. It doesn’t shrink after washing and comes in different sizes.


  • Warm and comfortable
  • Sturdy and durable
  • It is light weight
  • Doesn’t shrink


  • Quality is not too great, but worth the money
  • Sizing issues, so you will have to up your size

ColdPruf Men’s Dual Layer Long Underwear

ColdPruf Men’s Basic Layer Base Layer Bottom is a long underwear that is uniquely designed to hold up the air between fabric’s layers to provide natural warmth to keep you warm and comfortable. The inner and outer layers are made of 60 percent cotton with a blend of 40 percent polyester for durability and comfort.

It is suitable for both cold and extremely cold weathers with low to medium physical activity. Whether you are indoor or outdoor, THE BASIC is capable of delivering warmth and comfort. The ring spun yarns offers exceptional softness, and it has a comfortable waistband.


  • Made of great fabric
  • Offers extra strength and durability
  • Suitable for extremely cold weather
  • Soft, warm and comfortable to use


  • Quite tight at ankles
  • Not very tight to the body to retain more heat

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Buying the warmest thermal underwear for cold weather will not only keep you warm and comfortable, but will also help to enhance healthy living. It helps to boost heart functions, enhance blood circulation and keeps you healthy generally. Our buying guide on the best thermal underwear will help you get the desired choice in 2018.

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