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Thermal underwear

Thermal underwear, or so-called functional underwear, was initially only used by top level athletes and sportsmen. Nowadays, functional underwear is an essential part of every policeman's or soldier's gear and is particularly popular among outdoor and sport enthusiasts.

At Armed.eu you can find functional thermal underwear with short and long sleeves, thermal underpants and complete sets.

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Gen III Silk Weight Underwear Top, black, Rothco

Gen III Silk Weight Underwear Top, black, Rothco

Rothco Gen III Level I Silk Weight Underwear Tops are part of the ECWCS (Extended Cold Weather Clothing System) which provides extra warmth in cold climates.
3x
1 variant in stock from 20,63 €
Gen III Silk Weight Bottoms,  black, Rothco

Gen III Silk Weight Bottoms, black, Rothco

Rothco Gen III Level I Underwear Bottoms are part of ECWCS (Extended Cold Weather Clothing System) which provides extra warmth in cold climates.
4 variants in stock from 19,64 €
Functional Thermal T-shirt COOLMAX®, Mil-Tec

Functional Thermal T-shirt COOLMAX®, Mil-Tec

A functional thermal T-shirt that is made out of Coolmax® material, which wicks sweat away well and dries quickly.
2 variants in stock from 19,41 €
Rapid Half Zip Combat Shirt, 5.11

Rapid Half Zip Combat Shirt, 5.11

Inspired by our popular Rapid Assault Combat Shirt, the Rapid Quarter-zip is built from a high performance, quick-dry, two-way stretch polyester/spandex fabric…
2 variants in stock from 86,50 €
Tight Crew T-Shirt, Black, 5.11

Tight Crew T-Shirt, Black, 5.11

With athletic and very tight fit, the Tight Crew T-shirt is suitable as a bottom layer under ballistic or tactical vests. The combination of materials ensures…
2 variants in stock from 45,11 €
Range Ready Merino T-shirt, 5.11

Range Ready Merino T-shirt, 5.11

Merino is unique among the materials. The properties of this wool seem almost miraculous. The Range Ready Merino T-shirt from the American manufacturer 5.11 is…
4 variants in stock from 88,95 €
Tropos Baselayer Pants, 5.11

Tropos Baselayer Pants, 5.11

Tropos Baselayer Tight will keep you dry while training, traveling and working outdoors. The antimicrobial properties of Graphene will keep you smelling fresh.
4 variants in stock from 55,84 €
Thermal Underwear, 2nd layer ECWCS, Gen III, black, MFH

Thermal Underwear, 2nd layer ECWCS, Gen III, black, MFH

The MFH Thermal Underwear is of the Generation III thermal underwear and as such it offers many of the latest technologies. It is an ideal second layer of the…
1 variant in stock from 16,76 €
Functional intervention T-shirt Merino Wool FD, long sleeve, 4M

Functional intervention T-shirt Merino Wool FD, long sleeve, 4M

The best functional Merino T-shirt in the market! The range of functional wear CZ 4M Merino Wool FD is, thanks to its features, an absolutely unique product…
1 variant in stock from 119,21 €
Range Ready Merino Long Sleeve T-shirt, 5.11

Range Ready Merino Long Sleeve T-shirt, 5.11

Merino is unique among the materials. The properties of this wool seem almost miraculous. The Range Ready Merino T-shirt from the American manufacturer 5.11 is…
3 variants in stock from 101,36 €
Rapid Ops Tactical Long Sleeve T-Shirt, 5.11

Rapid Ops Tactical Long Sleeve T-Shirt, 5.11

The Rapid Ops Shirt was specially designed to be worn under a protective vest. The new version offers more comfort and is even more wear resistant. With high…
5 variants in stock from 119,83 €
Underwear Full Set US Level 2, Helikon

Underwear Full Set US Level 2, Helikon

Level 2 is a warm underwear for cold weather use. The fabric used warms the body, while wicks surplus humidity away, to other layers.
11x
Not in stock from 55,84 €
Underwear Full Set US Level 1, Helikon

Underwear Full Set US Level 1, Helikon

LVL 1 Underwear is the base, next-to-skin, clothing layer. It prevents irritation and discomfort caused by high-energy output combined with carrying of…
14x
Not in stock from 39,28 €
Functional intervention T-shirt Merino Wool FD, short sleeve, 4M

Functional intervention T-shirt Merino Wool FD, short sleeve, 4M

The best functional Merino T-shirt in the market! It is designed for intervention teams and line units as a basic protective layer for all-day wear.  The range…
Not in stock from 104,30 €
Winter Underwear Level I Pants, 4M

Winter Underwear Level I Pants, 4M

The CZ 4M Level I underwear set includes long underpants. Thermal comfort is provided by MOIRA Thermon. The material transfers body moisture to the outside of…
Not in stock from 64,15 €
Winter underwear Level I, 4M

Winter underwear Level I, 4M

Layer I layer consists of a long sleeve shirt with an inch per inch. Thermal comfort is provided by MOIRA Thermon. The material transfers body moisture to the…
1x
Not in stock from 64,15 €
Functional Assault Underpants Merino, 4M

Functional Assault Underpants Merino, 4M

The best functional merino clothing in the market! The range of functional wear CZ 4M Merino Wool FD is, thanks to its features, an absolutely unique product…
Not in stock from 119,21 €
Winter pants Moira level 2, 4M

Winter pants Moira level 2, 4M

The CZ 4M MOIRA Level II underwear was developed by MOIRA for the tactical range of CZ 4M clothing as a layer of functional clothing in extreme conditions.
Not in stock from 79,06 €

USE OF THERMAL UNDERWEAR

Thermal underwear is perfect for winter sports, hinking, jogging, hunting, fishing, whilst on duty, at the shooting range, outdoors or for casual winter activities - simply whenever we need to stay warm and breathable.

Thermal underwear will make sure you stay comfortable during both physical or passive activity, both in colder or warmer temperatures. We choose the most suitable combination of functional clothing with respect to what activity we want to perform as well as to which season of the year it currently is. With that in mind, we choose the most ideal number of layers. Very importantly, it is essential to always use the right number and combination of functional underwear so that the whole set remains breathable.

FUNCTIONAL THERMAL UNDERWEAR - WHAT IS IT MADE OF

One of the main aspects that ensures the correct functionality of thermal underwear is the material it is made of. As such, functional clothing is usually made of synthetic fibres or combined materials that contain a variety of fibres. These fibres absorb the moisture that we produce during physical activities and wick it away from the body. For instance, thermal underwear made of Merino wool and MOIRA are excellent at doing exactly so it is no surprise they have both surged in popularity in recent years.

The fibres essentially transfer excess heat to ensure an optimal body temperature. This is the main function of the first layer, which is worn directly on the body and which increases our thermal comfort. This will ensure that during demanding physical activities our back will not sweat and our body is not going to overheat. Thus, it allows the body to better maintain its natural temperature.

The key to ensure the most effective functionality of our thermal underwear lies in the correct layering. It is very important to keep in mind that a poorly chosen second or third layer can interfere with the functioning of all layers.

LAYERs of THERMAL UNDERWEAR

  • The first layer of thermal underwear should be comfortable, stretchable and breathable in order to ensure comfort and moisture wicking. It must fit the body well so that it can effectively wick away heat and moisture whilst providing breathability.
  • The second layer of the thermal underwear is most often worn over the first layer. We use it when we need to move the thermoregulation point higher - i.e. when it is rather cold out there. The first layer takes heat away from the body and transfers it to the second layer. The second layer itself is often made of synthetic hollow fibres. The hollow fibres heat the air and thus keep the body warm. Excess heat is, of course, again transferred away from the body - just like the first layer.
  • The third layer is another layer that increases the overall thermal comfort and acts as a covering and protection against external elements (such as rain and wind) and against mechanical damage. As the third layer we usually opt for membrane, softshell or fleece jackets.