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In recent discussions, there has been a lot of debate about which fabric—Kesi, Salam, air velvet, or hollow velvet—is the warmest. Similarly, questions have arisen regarding which material among space fiber, bamboo charcoal fiber, and far-infrared fiber provides the most heat. This winter’s unusual temperature drop has sparked a surge in demand for thermal underwear, making it a hot topic in the market. As consumers become more aware, they are increasingly scrutinizing product quality, and businesses are employing various gimmicks to attract attention. A recent TV program highlighted this common yet critical issue.
**New Products Driving Market Trends**
Over the years, as the textile industry continues to evolve, companies have significantly improved their innovation capabilities, introducing a wide range of functional fibers that open up new possibilities for product design and development. Some experts believe that these functional textiles are now shaping the future of the textile market. In the context of winter underwear, besides traditional thermal wear, "fever" underwear has recently become a popular trend in marketing strategies.
According to industry experts, "fever" fiber is a relatively new type of functional fiber first developed in Japan by companies like Toyobo, Asahi Kasei, and Metro. These fibers are made using ultra-fine synthetic fibers combined with heat-generating materials during the spinning process, such as polyester or acrylic ultra-fine denier fibers. The heating effect can vary between 1 to 10 degrees Celsius, 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, fever fiber is primarily used in medical bandages, where there are no official testing standards. Instead, the amount of heat-generating fiber is usually determined based on customer preferences. Some domestic manufacturers have started incorporating fever fiber into clothing and undergarments to enhance warmth. However, experts emphasize that thermal underwear and fever underwear operate on different principles. Fever underwear uses active heating through moisture, generating heat when worn, while thermal underwear relies on passive insulation to retain body heat without producing any active warmth.
Due to the lack of standardized regulations for fever underwear, some companies have taken advantage by exaggerating product features, leading to confusion and negative consumer feedback. To address this, in November 2007, the China Consumer Association and the China Knitting Industry Association held a meeting to clarify the differences between fever and thermal underwear. They provided detailed explanations and experimental demonstrations, advising consumers to check if the product clearly states the name of the heating fiber, its heat output, and the percentage of other materials. Additionally, the China Knitting Industry Association began developing a standard for fever underwear, ensuring that products labeled as such meet specific requirements, such as a minimum heat increase of 5°C and at least 5% heating fiber content. This initiative has gained support from several well-known brands.
Despite these efforts, some sales representatives still confuse consumers by misrepresenting the properties of materials like Kesi, Salam, bamboo charcoal fiber, and hollow wool. For instance, a purchasing guide from a lingerie brand once claimed that "bamboo charcoal fiber can generate heat and provide good thermal effects," which is misleading and confusing for both customers and industry insiders. Such misinformation not only creates market confusion but also leads to consumer misunderstandings. It's crucial for buyers to be informed and discerning when choosing products in this evolving market.