1. It is made of combed pure cotton yarn, with an inner layer and an outer layer, and the middle interlayer is thermal insulation cotton. The abdomen, waist and knees of trousers have thickened layers, which are composed of far-infrared filaments, thermal insulation cotton and metal films. Warm pants have the functions of ultra-light, ultra-thin and warm, and can be well protected from wind and cold after being put on. Therefore, warm pants can't get hot, but don't let the heat in the body run away.
Two principles
1. A kind of warm pants made of multi-layer warm-keeping materials, which is characterized in that the warm pants are woven by the inner and outer layers of combed pure cotton yarn 1 and 3 and the interlayer heat-insulating cotton 2, and the abdomen, back waist and knees of the warm pants are respectively provided with a thickened layer, and the thickened layer consists of three layers of metal film 4, heat-insulating cotton 5 and far-infrared filament 6 (close-fitting) from inside to outside.
2. Old-fashioned thermal underwear is to enhance the wind resistance by adding an ultra-thin hot-melt film (commonly known as PVC plastic film) to the thermal lining, but this product is easy to make a "rustling" sound when wearing, and its air permeability is affected, which will make it feel "hot" and easy to generate static electricity. A new generation of thermal underwear products, using new materials and new technology instead of hot melt adhesive film, basically overcome the above shortcomings. Just shake it gently or rub it with your hands when you buy it, and listen to it. You can tell by the rustling sound.
3. All kinds of thermal underwear have made people feel at a loss, and the advertising words full of science and technology are even more confusing. Far-infrared warm pants, nanotechnology, "Ryan" and "Lycra" fibers, and ecological cotton ... Can these unfathomable terms really make underwear the "top three sweaters"?
Wen Yongfen, a senior engineer of China Textile Institute, said that in fact, no matter how well thermal underwear is made, it can only raise your body temperature by 2-3 degrees Celsius at most. It's a bit of an exaggeration to say how many sweaters to wear. Thermal underwear generally relies on three ways to keep warm, one is to improve textile materials and isolate the air; The second is to add film to keep warm; The third is to use new technology to add special materials to fibers. "Ryan" and "Lycra" fibers belong to the first type. This kind of fiber has a hollow structure, which can isolate air and keep warm, just like wool. 1998 most of the first generation thermal underwear adopted the second thermal insulation method, that is, a reflective film was coated between two layers of fabric. Now, the "far infrared" technology, which we hear the most and know the least, belongs to the third kind of warm-keeping measures. When spinning, zinc oxide or zirconia and other ceramic materials close to nanometer level are added to the fiber. Because these ceramic materials can stimulate the microcirculation of human blood, they can play a certain role in warming up.
Professor Wen believes that different people have different physical conditions and feel different when wearing clothes. If you want to test the quality of underwear you buy, an indigenous method is to compare thermal underwear with ordinary underwear. Both pairs of underwear are wrapped in water at the same temperature and put in the refrigerator at the same time. After a while, see if there is any difference in water temperature. For the "sky-high price" of thermal underwear, Professor Wen said that it is mainly advertising fees. The reasonable price should be about twice that of ordinary cotton underwear.