Mil-Tec 4-Way Stretch Performance Thermoactive Underwear - Black

I wear it as a base layer under my outfit/jacket and for active movement—it fits snugly but does not restrict me, since it stretches in all directions. The biggest advantage is that it wicks moisture well: when you sweat and then stop moving, you don’t feel that “cold, wet compress” on your back. It feels pleasant against the skin, and the seams do not chafe if you choose your size without being too tight. A nuance: this is specifically a thermal active layer, not a “warmer.” When you’re not moving, it won’t keep you very warm; it works best together with fleece/insulation on top. It’s better to wash it gently and not dry it on a hot radiator, as the synthetic fabric loses its shape faster. Overall, as an inexpensive, functional thermal piece, it’s very good, especially for training, walking, and working outdoors.

M... Review confirmed by purchase

20%

13.02.2026

The long johns are warm, comfortable, and fit well – size M suits my height of 174 cm and weight of 76 kg. The material is okay, but the seams are weak – after one day and four hours of wearing, the seam on the outer side of the calf ripped open. I haven't tested the upper part yet.

Excellent quality, very pleasant to the touch. Tested at a temperature of about 3 degrees below zero. First-rate quality, I recommend it to those who are still hesitant, the price is also reasonable.

It is very comfortable and flexible, fits the body perfectly and does not restrict movement. It effectively wicks away sweat, dries quickly, and is very convenient during workouts or outdoor activities. It works great as a first layer of clothing, and its quality definitely deserves praise.

I used it during activities on cooler days and was pleasantly surprised by the wearing comfort. The material fits the body well, does not restrict movement, and quickly wicks away moisture, keeping the skin dry. Even with more intense exertion, there is no feeling of overheating or discomfort. After several washes, it has not lost its shape or elasticity. Another plus is that it dries quickly. The downside may be that in very low temperatures it requires an additional layer, but as a base layer it works very well.

Very comfortable and flexible, fits the body perfectly and does not restrict freedom of movement. Efficiently wicks away sweat, dries quickly, and guarantees comfort both during exercise and outdoor activities. Excellent as a first layer, and the quality is definitely at a high level.

After unpacking, I noticed that the product has a hole – it was immediately visible. The material is extremely unpleasant to the touch, and the seams are so poorly sewn that you can feel them on the skin, which is very uncomfortable during use. The quality of the item is really terrible. I regret buying it. Honestly, long johns bought for 20 PLN at the market would have been better.

It is very comfortable and flexible, fits the body perfectly, and does not restrict freedom of movement. It efficiently wicks away moisture, dries quickly, and ensures comfort during outdoor activities and exercise. It works great as a base layer, and the quality is at a high level.

T... Review confirmed by purchase

100%

25.01.2026

I definitely recommend it, very good quality, works perfectly in the field. It helps even in -10°C frost, ideal for duty and hiking or mountain trips. It's worth checking out.

J... Review confirmed by purchase

100%

19.01.2026

Perfect underwear for temperatures around zero; combined with a fleece sweatshirt, you definitely won't get cold. I wear it for walks in the fields and forests under Helikon clothing and it works very well. Well sewn, nothing falls apart.

G... Review confirmed by purchase

100%

09.01.2026

Great value for the price. Fits the body perfectly, is warm and comfortable. Does not restrict movement. Unlike some underwear from supermarkets, it does not bother you while working.

This thermal underwear pleasantly surprises from the very first wear. The material is soft, elastic, fits snugly to the body, but does not press or restrict movement at all. You can feel that it really works: it wicks away moisture well, dries quickly, and helps maintain a comfortable temperature even during vigorous activity. In black, it looks neat and versatile, and does not cause discomfort under other clothing. After prolonged wear, there is no “greenhouse effect,” which is especially important in cold weather. Overall impression is very positive – this is exactly the thing you start to appreciate not for its appearance, but for the consistent comfort it provides throughout the day.

X... Review confirmed by purchase

100%

06.01.2026

I bought this for my husband. The quality is great, and the material doesn't irritate the skin. It worked perfectly during hikes at -3 degrees Celsius, meeting our expectations. The colors of the underwear are really interesting.

W... Review confirmed by purchase

100%

05.01.2026

I am very satisfied with the purchase. The clothing is comfortable, provides good protection against sweat, and maintains the right temperature. It works great in the current weather. Even though I wear it under a jacket and warm pants, I really appreciated it during a long walk in a snowstorm at around -5°C.

K... Review confirmed by purchase

100%

29.12.2025

I am very satisfied. For this price it's really amazing – I was pleasantly surprised because the product is incredibly comfortable and enjoyable to use. As soon as I put it on, I felt that it warms up perfectly. I definitely recommend it due to the excellent combination of price and quality. I plan to buy another pair because it works great at temperatures around zero, which is exactly what I was looking for. It doesn't restrict movement. It's an excellent choice for people looking for thermal clothing at an attractive price. Size S/M fits well for a person with a height of 171 cm and a slim build, fits perfectly. Highly recommended!