165438+1Since late October, cold air has raided and Chengdu has started the "quick freezing" mode. At this time, "self-heating underwear" won the favor of many people by relying on advertising words such as "seamless", "ultra-thin" and "heating", and its sales volume soared.
Searching for "self-heating thermal underwear" and "self-heating underwear" on e-commerce platforms such as Taobao, JD.COM and Store 1 found that the product information is 100 pages at a time, and the price is also more expensive than ordinary underwear, ranging from 100 yuan to several hundred yuan. The monthly sales volume of a hot-selling underwear on Taobao is as high as "250,000+". On the Internet, various supermarkets also put out different brands of thermal underwear, and many consumers came to buy them.
The reporter found that there are many brands and materials of these heating underwear, and there is no unified name. As can be seen from the tag, the main components are polyester fiber (polyester), viscose fiber, modal fiber, acrylic fiber, spandex and nylon. In the introduction of some brands, it is also indicated that special materials have been added, such as "moisture absorption and heat generation German new fiber", "warm black velvet heat generation fiber", "imported Dongli velvet fiber" and "Lycra fiber".
Most heating underwear merchants claim that clothes are made of "black technology" materials, which can keep warm by heating themselves.
"Expert:"
"Over-functional, but with different air permeability, without heating"
Can these underwear materials really heat up? "This is an easy thing to expose. I have been engaged in clothing work for more than 40 years and have never seen underwear that can still heat itself. " An industry expert of the former Chengdu Garment Industry Association said bluntly.
Cheng Weixiong, an expert in brand management of textile shoes and clothing and general manager of Shanghai Liang Qi Brand Management Co., Ltd., also gave a negative answer. He said that the so-called "heating fiber" can't heat up, but the merchants "over-functionalize" these things. "Some fibers are breathable and some are airtight. The airtight heat preservation effect is good, but the breathable effect is poor. In general life, if it is cold, you should wear more clothes to reduce air permeability; Wear less calories and increase breathability. " Cheng Weixiong believes that this is a simple principle.
The above-mentioned experts in the industry also gave the same view that thermal underwear is not "high-tech": no matter what kind of material, it can generate heat through moisture absorption. The mechanism of fiber moisture absorption and heat generation is that when fiber absorbs water, hydrophilic groups in fiber molecules combine with water molecules, and the kinetic energy of water molecules decreases, and at the same time it is converted into heat energy and released. For example, wool and modal fibers have good moisture absorption and heating effects, while ordinary acrylic fibers and polyester fibers have poor moisture absorption and heating effects. In the final analysis, this is "whether the effect of keeping warm is more or less, not whether the fiber itself can heat up."
"To put it bluntly, (self-heating) is nothing more than a gimmick of the merchant." Cheng Weixiong told Red Star News reporter that as early as ten years ago, some clothing brands had made marketing slogans of "fever" and "spontaneous fever".
From the point of view of health and environmental protection, Cheng Weixiong suggested that people should choose natural fibers, such as cotton, hemp or silk, when buying underwear, and check their specific components. In addition, you should choose formal channels and brands when buying, and don't simply choose according to the price.