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In recent discussions, a question has been raised: which fabric among Kesi, Salam, air velvet, and hollow velvet offers the most warmth? Or, when it comes to materials like space fiber, bamboo charcoal fiber, and far-infrared fiber, which one provides the highest heat? This winter’s unusually low temperatures have sparked a surge in demand for thermal underwear, making it a hot topic in the market. As consumers become more discerning, the quality and effectiveness of these products are under closer scrutiny. But how many exaggerated claims are being made by manufacturers trying to stand out?
**New Products Drive Market Trends**
Over the past few years, the textile industry has seen rapid innovation, with companies developing a wide range of functional fibers that enable new product designs and features. These innovations have created fresh opportunities for downstream manufacturers. Some experts argue that functional textiles are now driving the evolution of the textile market. In the case of winter underwear, besides traditional thermal wear, "fever" or heating underwear has recently gained popularity as a key selling point.
According to industry experts, "heating fiber" is a relatively new type of functional fiber developed in Japan. Companies such as Toyobo, Asahi Kasei, and Metro have introduced this technology. Heating fiber is produced by incorporating heat-generating materials into ultra-fine synthetic fibers during the spinning process, such as polyester or acrylic ultra-fine deniers. The temperature generated by these fibers can vary between 1°C to 10°C, depending on the composition and quantity of the added materials.
Yu Jianjun, director of the National Knitting Product Quality Supervision and Inspection Center, explained that in Japan, heating fiber is primarily used in medical bandages, where there are no strict testing standards. Instead, the heat output is often determined based on customer specifications. Some domestic companies have started using heating fiber in clothing and undergarments to enhance their warming properties. However, experts emphasize that heating underwear and thermal underwear operate on different principles. While heating underwear uses active heating through moisture, thermal underwear relies on passive insulation to reduce heat loss. The latter does not generate heat on its own.
Due to the lack of clear standards for heating underwear, some companies have taken advantage of the ambiguity, exaggerating product benefits and misleading consumers. To address this issue, in November 2007, the China Consumer Association and the China Knitting Industry Association held a meeting to clarify the differences between heating and thermal underwear. They provided detailed explanations and conducted experiments to help consumers distinguish between the two. They also advised buyers to check if the product clearly states the presence of heating fiber, the level of heat it produces, and the percentage of other materials used.
Furthermore, the China Knitting Industry Association has begun developing a standard for heating underwear. Under this standard, only products that meet specific requirements—such as a minimum heat increase of 5°C and at least 5% heating fiber content—can be labeled as "heating underwear." This initiative has been widely accepted by major brands in the industry.
Despite these efforts, some salespeople still confuse consumers by misrepresenting the functions of materials like Kesi, Salam, bamboo charcoal fiber, and hollow wool. For example, a purchasing guide from a lingerie brand once claimed that "bamboo charcoal fiber can generate heat and provide excellent thermal effects," which is misleading and inaccurate. Such misinformation can cause confusion among customers and lead to misunderstandings about the actual performance of these products. It's essential for consumers to stay informed and make educated choices when selecting thermal or heating underwear.