In winter, a good and proper thermal regime is not a luxury or an option exclusively for athletes, but a matter of health for each of us. Properly selected thermal underwear for people of any age and lifestyle helps retain warmth, wick moisture, and not turn into a "steam room" under a down jacket. The main thing is to understand that different models are designed for different tasks: some feel cold in the office, some snowboard, and some just need to walk comfortably in the cold. We have gathered the main points to consider when choosing.
How Thermal Underwear Works
The main principle is to retain body heat through a layer of air between the skin and the fabric, while the material actively wicks moisture away. If sweat remains on the body, a person begins to feel cold, which is why even the highest quality thermal underwear does not warm by itself, but helps the body retain its own heat. It is important to remember: thermal underwear should fit snugly but not constrict. The space between the body and the fabric is the "thermal layer" that maintains comfort.
Materials: Synthetics, Wool, Blends
For active individuals, synthetic materials such as polyester, polypropylene, and nylon are suitable. They quickly wick moisture and dry rapidly. For moderate activity, a blend of synthetic and natural fibers works better—such as merino wool. For extreme cold, 100% merino is ideal: it is warm, hypoallergenic, and does not absorb odors. If you have sensitive skin, choose soft flat seams and pay attention to the labeling "soft touch" or "seamless"—without them, even the best underwear can chafe.
How to Choose Size and Fit
The main rule is no folds or wrinkles. The underwear should fit like a second skin; otherwise, the thermal effect is lost. Check: if you can move freely, the fabric does not twist or pull—then the size is correct. Remember that it is better to choose the top and bottom separately according to your figure rather than taking ready-made sets: most brands have different patterns. When trying on, raise your arms and bend over—if your back remains covered, then the fit is correct.
For What Tasks to Choose
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City and Office: Lightweight models made from microfiber or blended fabrics are suitable, as they do not overheat and are inconspicuous under clothing.
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For Walks and Trips: It is better to choose medium density, as it will retain heat outdoors and prevent sweating in transport.
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Sports and Active Recreation: Here, professional sets with reinforced ventilation zones are needed—such as on the back, underarms, and knees.
Ideally, you should have two options: one set for everyday use and another for cold weekends and trips.
Care for Thermal Underwear
Wash it at 30–40°C, without conditioners and bleaches—these destroy the fibers responsible for moisture wicking. It is better to use a liquid detergent for delicate fabrics or a special gel for sports clothing.
Dry away from radiators and direct sunlight. If the item is woolen, it can be lightly wrung out in a towel and laid flat to dry. With proper care, good thermal underwear lasts 3–5 seasons without losing elasticity and shape.
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