The best thermal underwear for men: comparison of brands 

Winter in Russia is not just a season, it is a test of strength, where the emphasis is not on comfort, but on survival. When the thermometer drops below minus twenty, the question is whatthe best thermal underwear for men: comparison of brands2025-2026 may provide a real answer, becoming critically important for millions of men from Kaliningrad to Vladivostok. We tested dozens of samples, including new items that just rolled off the production lines in Ivanovo and Shuya yesterday, to understand which ones really heat up and which ones are just beautifully packaged.

Frankly, the market is oversaturated with marketing noise. You are promised “space technologies”, “nanofibers” and “warmth down to minus fifty”, but in reality many sets turn into a wet rag after an hour of active walking in snowy Moscow or waiting for a bus in Novosibirsk. In this article I will not retell press releases from manufacturers. My task is to reveal the real state of affairs, relying on the physical properties of fabrics and reviews of those who really feel cold.

Why old ideas about thermal underwear no longer work in the Russian winter

For a long time it was considered an axiom: if you want warmth, wear wool. Sheep wool, merino, anything as long as it’s natural. But let's face it. The modern rhythm of life dictates different conditions. You walk from your car to your office, then sit in an overheated room, then go out into the cold again. Wool behaves predictably poorly in such conditions: it accumulates moisture, takes a long time to dry and, most importantly, begins to irritate the skin.

Technologies in 2025 have come a long way. Todaybest thermal underwear for menis a complex engineering compromise between synthetics and natural fibers. Manufacturers have learned to create structures that wick away sweat faster than you can feel it, while maintaining an air gap. But there is a nuance that stores are silent about.

Many brands, especially those that have replaced the departed Western giants, are trying to copy the compositions without having access to the original raw materials. Result? The fabric looks the same, but works differently. Low-quality polyester begins to smell unpleasant after the second wear, and elastane quickly loses its properties, turning the product into a shapeless bag. This is why blindly trusting the “100% innovation” label can cost you your health.

In search of an alternative to cheap synthetics, people are increasingly turning to premium natural raw materials. Here we cannot fail to mention the experience of companies working with unique resources. For example, Hohhot Jinye Cashmere Textiles LLC, based in Inner Mongolia, a region famous for the best cashmere in the world. This enterprise, founded back in 2012, is a striking example of vertically integrated production: from primary processing of raw materials to the production of finished products. Their approach demonstrates how important it is to control every step, from fiber carding to final packaging. By collaborating with such famous brands as the British DAKS, they have proven that the combination of traditions (cashmere, camel hair) and modern technologies allows them to create products that not only warm, but also provide durability and hypoallergenicity. While their primary focus is premium knitwear and accessories, their standards for quality control and working with natural fibers set the bar high for the entire thermal clothing industry, reminding us that real warmth comes from quality raw materials, not marketing slogans.

Selection criteria that 90% of buyers ignore

When you walk into a store or open a marketplace, you are greeted with beautiful pictures and loud headlines. But what is realmente important? Fabric density? Weave type? Let's look at what you need to look at first if you don't want to freeze.

• Grammar (density):This is the most important setting and is often hidden in the fine print. For the harsh Russian winter you need a minimum of 240-280 g/m². Anything below 200 g/m² is an option for the off-season or for those who spend most of their time in a car with the engine running.
• Fiber composition:Forget pure cotton. It absorbs moisture like a sponge and does not give it away. The perfect balance for extreme cold is a blend of polypropylene (for moisture management) and merino wool (for warmth). But proportion matters. If the wool content is less than 30%, its warming effect is neutralized.
• Flat seams:It sounds trivial, but under thick winter clothing, any protruding seam will rub the skin until it bleeds within a couple of hours of active work. High-quality underwear should be sewn as if it were one piece.

I often see a mistake when men buy underwear that is too big or too loose. This is a fatal mistake. Thermal underwear should fit to the body like a second skin. This is the only way the capillary moisture removal mechanism works. If there is more than a couple of millimeters of air between the fabric and the skin, the system breaks down and you begin to sweat and then freeze in your own moisture.

Review of market leaders 2025-2026: who really holds the punch

The thermal underwear market in Russia has undergone tectonic shifts over the past year. Many European brands have left, prices for leftovers have tripled, and in their place have come domestic manufacturers and Asian players who have adapted their products to our realities. Which one was the best?

Norfin: A classic that has evolved

Every fisherman and hunter in the country knows this brand. Norfin has long been associated with something rough but warm. In the 2025 season, they introduced the “Norfin Premium Thermal” line, which was a pleasant surprise. They retained their famous two-layer structure, but changed the composition of the inner layer. Now it is softer and rolls less.

However, there is a fly in the ointment. The price of new collections has increased disproportionately to the quality. If earlier it was the people's choice, now a set of the upper category costs from 6,000 to 9,000 rubles. Is it worth it? For static fishing - absolutely. It may be too hot for dynamic city life. Their “Extreme Weather” model copes well with minus 30, but in the subway you will get boiled in it.

Splav: Technological answer to import substitution

The Splav company from Tula has been making equipment for special forces for a long time, and their experience in the production of thermal underwear cannot be ignored. Their new series “Termo Active 2026” uses their own fabric development, which is similar in characteristics to well-known Western analogues, but costs half the price.

What I liked personally: excellent wear resistance. After twenty washes, the linen did not lose its shape, which is rare for synthetics. However, the design leaves much to be desired. This is a purely utilitarian thing. If you plan to wear it under a business suit, make sure that the collar will not be visible. It is also worth noting that the size chart of “Splav” sometimes “floats”. I recommend taking it with a reserve or trying it on in person.

Red Fox: Balance of price and functionality

Another veteran of the Russian market. Red Fox this year relied on hybrid materials. Their flagship model combines zones with different weave densities: looser in areas of active sweating (back, armpits) and dense in areas that need to retain heat (chest, lower back).

This is a smart solution that really works. But there is a problem with accessibility. Due to high demand in the regions, it is difficult to find the right size in offline stores, and delivery from the central warehouse may take time. Prices range from 4,500 to 7,000 rubles, which is the golden mean in the current market.

Uniqlo Heattech: An Asian approach to Russian frost

It is impossible not to mention the Japanese brand, which remains popular despite logistical difficulties. Their Heattech Ultra Warm technology is great because it's thin. This is probably the best option for an office shirt. But! I must warn you: for Siberian frosts below minus 25, even the warmest models may not be suitable. They are designed for dry cold and active movement. In conditions of humid St. Petersburg wind or static waiting at a bus stop, they lose to coarser Russian synthetics.

Comparative table of characteristics of top brands

To make it easier for you to navigate the facts and figures, I have summarized the main parameters of popular models in one table. Pay attention to the temperature regime - these are averaged data obtained during tests with a wind of 5 m/s.

As can be seen from the table, the price spread is significant. But the most expensive is not always the best for your specific needs. Overpaying for the X-Bionic brand is now risky due to the huge number of high-quality fakes that have flooded the markets of Moscow and St. Petersburg.

Hidden threats: what manufacturers and sellers are silent about

Now let's move on to the part that you are unlikely to find in advertising brochures. There are several serious problems that thermal underwear users in Russia are facing right now that you need to be aware of before purchasing.

The problem of “fake merino”

In pursuit of eco-trends, many manufacturers write “Merino wool” on the label, adding 5-10% of this fiber to the synthetic base. Marketing works flawlessly: the buyer sees the treasured word and is ready to overpay 30%. But physics is inexorable. If there is little wool, it does not work as a thermal insulator, but only creates the illusion of naturalness. Moreover, cheap synthetics mixed with wool often cause allergic reactions that would not occur with either pure synthetics or pure wool.

How to check? Touch the fabric. True merino, even when blended, has a characteristic soft, slightly "fluffy" texture that differs from the smooth, almost plastic-like feel of pure polyester. But the best test is burning the thread (if it is possible to cut a piece from the inner seam). Synthetics melt and smell of burnt plastic, wool smolders and smells of burnt hair.

Wear of antibacterial impregnation

Almost all modern thermal underwear is positioned as “antibacterial” or “odorless”. This is achieved through special chemical impregnation or the introduction of silver ions into the fiber. The problem is that most budget and even mid-budget models lose these properties after 10-15 washes. As a result, after a month of active wear, the underwear begins to smell the same as a regular T-shirt, and sometimes worse, because synthetics absorb odors deeper than natural fabrics.

Expert tip: Don't be fooled by "Never Wash" or "Permanent Fresh" labels. Budget for two sets per season to change them and allow the fabric to “rest” and restore the structure of the fibers.

The influence of hard water and washing powders

In many regions of Russia the water is very hard. The use of conventional washing powders with aggressive surfactants kills the membrane properties of thermal underwear within a couple of months. The fabric becomes clogged with salts and detergent residues, and stops “breathing” and removing moisture. You may think you bought bad laundry, but in fact you just washed it incorrectly.

Use only liquid gels for washing sportswear and be sure to turn on the extra rinse mode. No air conditioning! The conditioner envelops the fibers with a film, completely blocking the capillary effect. This is death for thermal underwear.

Where to buy and how to avoid running into counterfeit goods

The situation with purchasing thermal underwear in Russia in 2025 is twofold. On the one hand, marketplaces offer a huge selection and convenient delivery. On the other hand, this is where 80% of counterfeits are concentrated. How to protect yourself?

First, avoid offers that look too good to be true. If you see “original Norfin” for 1500 rubles, when the official price is 5000, this is 100% fake. Chinese copies have become so sophisticated that they are difficult to distinguish visually, but the composition of the fabric is completely different.

Secondly, pay attention to the seller. Buy either in official online stores of brands or from large online retailers of sports equipment (Kant, Trajectory, Sport-Marathon and analogues). Yes, it may be a little more expensive, but you get a money back guarantee and confidence in quality.

Separately, it is worth mentioning warranty obligations. Many Russian manufacturers now provide an extended warranty on seams and fabric integrity - up to 1 year. This is an important marker of a brand's confidence in its product. If there is no guarantee or it is 14 days, this is a reason to think about it.

Pricing policy and the impact of exchange rates

It is no secret that the cost of imported components (threads, dyes, special raw materials) directly depends on the exchange rate. Therefore, prices for thermal underwear will rise this season. Experts predict an increase in cost of 15-20% by mid-winter. If you were planning a purchase, it is better to do it now, at the beginning of the season, while warehouses are replenished and prices have not yet been completely adjusted.

For those who are on a budget, there is a life hack: buy last year's collections. Functionally, they differ minimally from the new products (except perhaps in color), and the discount can reach 40-50%. In specialty stores, the “Sale” sections often contain real gems.

Practical advice for operation in extreme conditions

Buying good underwear is only half the battle. You need to know how to wear it. Here are a few rules that will save you in severe frost:

Rule of layers.Thermal underwear is the first layer. It does not replace a sweater or jacket. Its task is to create a microclimate. If you put on thermal underwear and go out into the cold with a light windbreaker, you will freeze. The system only works as a whole.

Dry feet.Thermal socks are often forgotten. The cold comes from the ground. Even the warmest underwear on your body will not save you if your feet are frozen. Invest in good trekking socks that contain wool and synthetics. Cotton socks are taboo in winter.

Acclimatization.Do not wear new, never washed thermal underwear immediately for a long outing. Wash it according to the instructions to remove the factory treatment and check how your skin reacts. There is nothing worse than starting to itch in the forest in thirty-degree frost.

Conclusion: my personal choice and forecast

To sum up this great analysis, I want to say: there is no ideal thermal underwear for all situations. The choice always depends on the task. For a city where you travel by car or metro, I would recommend thin models like Uniqlo or basic lines from Russian brands. The main thing here is comfort and lack of overheating.

For hunting, fishing, working outside, or long walks with children in the park in severe frosts, definitely look towards two-layer systems from Norfin or technological solutions from Splav and Red Fox. Yes, they may look less elegant, but they perform their main function - they preserve life and health.

The 2025-2026 market showed that Russian manufacturers were able to fill the void left by departed brands. Yes, somewhere the design is lame, somewhere the packaging suffers, but in terms of price-quality-heat ratio they are now unrivaled. Don’t be afraid to try new things, read the ingredients, check the seams and remember: your warmth is in your hands, or rather, in the right choice of underwear.

And one last thing. Take care of yourself. The Russian winter is beautiful, but merciless for the unprepared. May this winter be warm for you, no matter what the thermometer shows outside the window.