Recently, the weather has turned cooler in Dalian, and various cold-proof clothing has become a hot spot for consumption. The author visited many shopping malls and found that in addition to the common thermal underwear, a kind of exquisite and stylish underwear that can generate heat has quickly become popular, with an endless stream of customers buying it, especially among young women. What is the heating principle of heating underwear? Are the heating underwear on the market propaganda or hype? Can heating underwear really replace cotton clothing to keep out the cold?
Heating materials are not high-tech
In an underwear store, the author has repeatedly heard the clerk say words such as “selam” and “modal fiber” when introducing heated underwear. It really sounds like “high, big and superior”. The waiter said that Seram is a ceramic with ultra-fine particles added to acrylic fiber to give it a heating effect; Modal fiber is a material similar to wool that has a hygroscopic and heating effect, and can convert it into heat after absorbing moisture and release it.
Wang Ruo, a dealer who has been selling underwear for many years, told the author that the concept of heating underwear comes from Japan. The chemical fibers or regenerated fibers contained in the heating underwear currently launched by some brands are mostly from petroleum by-products such as polyethylene. They have long existed and are It’s not a new invention, it’s just a different name.
Heating underwear is made of moisture-absorbing heating fibers, which actively generate heat by absorbing moisture emitted by the human body. This fiber material was first used by mountaineering team members, and was later promoted to the general consumer field, mainly used to produce underwear. Generally, the moisture absorption and heating performance is closely related to the moisture regain rate. If the moisture regain rate of the fiber is large, the moisture absorption and heating performance is good, such as wool; if the moisture regain rate is small, the moisture absorption and heating performance is poor. Ordinary acrylic and polyester have poor moisture absorption and heating properties. In other words, fabrics that are prone to moisture can easily generate heat after adding this special fiber.
“Heat” has become a new concept for merchants to hype
A salesperson in a shopping mall in the development zone told the author that most of the people who buy heating underwear are young women. Although it is expensive, it does not affect its popularity. The author has looked at several types of heating underwear recommended by store clerks, and the descriptions on the tags can be described as varied. Not only are there various fiber names, but some merchants also write various difficult words such as nano and catalyst into the product descriptions. In the mouths of store clerks, these are all falsely described as heating materials. The author has seen in many thermal underwear brand stores that the word “heat” can indeed “transform” the product.
A set of ordinary thermal underwear sells for about 200 yuan, but with the addition of heating promotion, the price of a set reaches 400 to 500 yuan. For thickened self-heating underwear, the price of a set soars to 1,000 yuan. A shopping mall salesperson said: “The underwear itself will definitely not heat, but it will keep warmth better than ordinary ones.”
Mr. Zhao, a citizen, told the author, “I first heard that underwear can generate heat, and I thought it was quite novel. The waiter also introduced that although this kind of underwear is expensive, it is light and warm, can absorb sweat, dehumidify, and retain heat. I bought a set for more than 400 yuan. After wearing it for a long time, I felt that my whole body was wet, and all the sweat on my body was covered in my underwear, and I smelled after wearing it for a day. “It seems that the heating underwear is not as comfortable as advertised, let alone as sold. The staff said it was so amazing.
Heating underwear cannot replace cotton-padded clothes
��In order to understand how well the heating underwear protects against the cold, the author conducted a test. At 6 o’clock yesterday morning, the temperature in Dalian was around 16°C. The author put on heating underwear, a pair of sweatpants and a small outer layer, and stood on the balcony for 30 minutes. The feeling of warming was not obvious.
Dr. Dong Dapeng from the School of Physics and Materials Engineering of Dalian University for Nationalities told the author that the current price of this kind of heating fiber is not low, and the source mainly relies on foreign imports, so heating underwear is made with a small amount of heating fiber and other fibers. Even if it is really heated underwear, its temperature rise cannot be very high. Generally, it can actively raise the temperature by 2℃~4℃, and the temperature increase is limited. Therefore, citizens should not use heating underwear instead of cotton-padded clothes, and should also pay attention to keeping warm. In addition, when consumers are purchasing heating underwear, they should not simply believe the empty introductions of advertisements and sales guides, and be deceived on impulse. It is best to go to regular shopping malls to purchase heating underwear.
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