Best Thermal Underwear (UK) for 2022

Last update by Jasper

If you want to enjoy the outdoors during the winter season, see to it that you are appropriately garbed. You would want to enjoy outdoor activities without you freezing to death or without you suffering from frostbite due to exposure to extreme cold. Rather than wear multiple layers of clothing, wear the best thermal underwear instead.

Invest in a good thermal top and bottom to protect you from the cold. Make sure you look for those with superior thermal capabilities that will work in giving you comfort even while outdoors. We looked for the best thermal underwear out there and found the ones worth your money.

  • Great for Outdoor Enthusiasts - Norde Thermotech Functional Thermal Underwear
  • Cheap Option - Octave ® Ultimate Mens Thermal Underwear Long Sleeve T-Shirt
  • Top Only - Mountain Warehouse Talus Men’s Thermal Baselayer Top
  • Great Choice for Women - Ultrasport women's thermal underwear set
Norde Thermotech Functional Thermal Underwear Check latest prize

Fend off the autumn or winter cold with this set of thermal underwear. This is an ideal choice for active individuals or those who do a lot of outdoor activities in the winter such as hiking, skiing, snowboarding and paragliding. If you love spending time close to nature even in the winter get this one. The double-seamless technology it boasts of will ensure that you are getting the best thermal properties. Wearing this won’t restrict your movements, thanks to its three-dimensional elastic zones.


  • This is a comfortable thermal wear for men. You can easily put this on and wear this under your autumn or winter clothes.
  • Those who are into active sports can choose those ones as it does not restrict movements. It is elastic enough that it follows your movements.
  • There are silver ions in its polymer structure, keeping the garment free from bacteria. You can be assured that it will stay fresh-smelling for a longer period of time. This might come handy for those taking a vacation up in the slopes or those who might have to go with only a few pairs of thermal underwear for days.
  • A lot of users have experienced using this set in extremely cold temperatures and they said this kept them nice and warm. It also kept them dry. It also has a nice stretch to it. It is true to size.
  • The fabric is thin but breathable. You don’t feel like your skin is being trapped.
  • Many users also commented on how easy it is to wash and how quickly it dries up. That means you can use it for traveling since it doesn’t take a long time to dry up.


  • Some said it is longer than they expected. There are also those who did not like the way the fabric felt against their skin. They said it tends to be a bit rough.
Octave ® Ultimate Mens Thermal Underwear Long Sleeve T-Shirt Check latest prize

Don’t break the bank with this thermal underwear. But although it comes with a small price, it is not lacking in amazing features. Its half cotton and half polyester material ensure that you are getting the superior comfort you need. You can wear this outdoors even when engaging in sports activities. The fabric feels very soft and comfortable, just right for people who don’t want their thermal underwear to chafe their skin.


  • This is truly comfortable. Aside from having a softer kind of fabric, it is also seam-free. There is no irritating seam that can chafe your skin.
  • It offers freedom of movements. It doesn’t feel restricting at all.
  • It is machine washable. There are customers who also liked how this maintained its size even though they used their washing machine to clean it.
  • This can keep you warm effectively. A lot of people also like the fit. They said it isn’t as tight as other thermals. They also like how soft the fabric is. It’s so comfortable, you can even use it under your pajamas.


  • There are customers that found the long johns a bit short for them.
Mountain Warehouse Talus Men’s Thermal Baselayer Top Check latest prize

Mountain Warehouse thermal underwear takes pride in their IsoTherm technology. This is a kind of technology that effectively retains heat, thereby ensuring warmth for a long period of time. This also boasts of an excellent ability to wick moisture away. It is easy to slip on and off and has a good fit that prevents cold air from seeping in your skin.


  • You will like how soft this baselayer is. It does not rub against the skin and features an Isotherm fabric material that truly keeps you warm even when exposed to cold temperatures. Moisture won’t stay long on your skin because this material will absorb it.
  • It is lightweight. You won’t even feel like you are wearing a base layer. This is ideal when engaging in outdoor activities that will require you to do a lot of maneuvers such as skiing or snowboarding.
  • It is machine washable. It dries up fast as well.
  • It is easy to pack as well. It folds down to a very small size.
  • The material is breathable. It keeps you warm but without feeling clammy.
  • Many people like the way it fits. They said it isn’t too constricting and they didn’t feel like being compressed.


  • There were only a few isolated cases of not getting the perfect fit. There is one that did not like the way it fit the neck and there is one who experienced having a bad fit around the wrists.
Ultrasport women's thermal underwear set Check latest prize

Women can keep themselves warm and dry in this thermal underwear. It is a lightweight kind of set that doesn’t get in the way of performing your usual activities. If you are active and you do a lot of outdoor activities, this is definitely a good choice for you.


  • This feels soft and has a superior warming effect. The crew neck enhances warmth at the top. The fabric doesn’t rub against the skin.
  • It is so light, you won’t notice you are wearing it. It also isn’t bulky, so if you are looking to wear some lighter clothes for the winter but don’t want your thermal underwear to show, this might be a good choice.
  • It actually has a body-shaping effect. The elastic structure of the fabric allows it to contour to your body shape better.
  • It keeps the skin dry. Sweat is expelled and prevents it from sticking on your skin.
  • This is easy to wash and dry, perfect for those vacations when you aren’t bringing a lot of undergarments with you.


  • Some said it is too thin for them and isn’t as warm as they expected.
By: Jasper

Jasper is a die hard outdoor fanatic. He loves to canoe, hike and bike.Every year he goes off grid for almost 2 weeks in Sweden.

He loves to hike in his home country, The Netherlands. Goes camping whenever he can.