Wardrobe Planning

How to choose thermal underwear?

How to choose thermal underwear?

You might plan a winter vacation or prepare for the colder months ahead. Either way, you’ll need to choose the right thermal underwear to keep you warm. But with so many options on the market, how do you know which one is right for you? Here are a few things to consider when choosing thermal underwear.

Who needs thermal underwear?

The first item on the agenda is the purpose of clothing. We cannot assume that clothing that provides thermoregulation is intended for athletes only. Similar kits are issued to other professionals such as divers, rescuers, oil workers, and representatives of many other professions. Even army units have their version of similar underwear for their personnel.

It is impossible to make one type of clothing that will protect people from being too cold and too hot. Therefore, different types of clothing are made from different materials depending on what people will use them for. For example, some thermal underwear is made for people who are going to do sports in cold weather, while others are for people who have to work in cold weather.

There are four types of underwear: Cool, Light, Warm, and X-Warm. Cool is for summer and protects against overheating. Light is also for summer and is lightweight. Warm insulated underwear for cool weather. X-Warm is for shallow temperatures with enhanced heat-saving properties. You can see the range of permissible temperatures on the packaging with linen.

Selection by material

It is important because it depends on the material and the final product’s characteristics. It means that some materials can help regulate temperature better than others. Unfortunately, although modern technologies can create materials with desired properties, we have yet to create a versatile fabric with ideal properties.

In this part of the world, not many people use 100% cotton or wool fabrics anymore. They can only be added to mixed fabrics for everyday wear in low percentages. Most thermal underwear is made from synthetic fibers like polyamide, polyester, spandex, microfiber, nylon, and fleece. These materials have some advantages over natural fibers. Let’s take a look at the comparison.


Cotton is a good material for summer because it does not hold heat. However, it is not a good idea to use cotton for thermal underwear in winter because you can get hypothermia. Adding an extra layer might help.


Here, we usually use fine merino wool. It is soft and does not cause discomfort when touching the skin. The heat is retained perfectly, but this option has problems with moisture removal. The material absorbs moisture slowly and dries even more slowly. Therefore, in the cold, with the active release of sweat, all the heat-saving properties of the material are reduced to zero. But if no particularly active movements are expected, the material option is ideal.

sportswear underwear

Synthetic fabrics

The type of fibers used in the fabric is not as important as the functionality of the fabric. For example, polypropylene removes moisture well and retains heat. Polyamide is even better at removing moisture and is also very light. Polyester is also elastic, which is vital for a snug fit.

How the fabric is made affects how the final product looks and feels. Therefore, it is essential for sportswear or underwear that you wear every day. Any synthetics can improve the desired qualities. When choosing, you only need to carefully look at what the thermal underwear consists of, and it will cope with the task assigned to it.

Choose a size

Underwear, like clothes, comes in different sizes. The same size range is used for underwear and any other clothing type. It is important to choose the right size for thermal underwear. It should fit snugly but not too tight so as not to restrict movement and circulation. The material must be breathable and stretchable to provide maximum comfort.


  • Decide clearly for what purposes you need the thermal underwear. Answer options: sports, outdoor activities, work, everyday wear.
  • Specify what functions it should perform: only heat saving or heat saving with moisture removal.
  • Considering the first two points, decide what composition the fabric should have.
  • Make sure to make sure the choice of size is correct.
  • Ask about the reputation of the company whose thermal underwear is offered to you. Read real reviews in which unexpected problems that have come to light during operation can be named.