以“丝”代“绒”，以次充好！你的羽绒服是真的羽绒吗？

Core Viewpoint - The article highlights the rising concern over the quality of down jackets sold online, particularly those labeled as "low-priced down jackets" that may contain inferior filling materials, misleading consumers about their warmth and quality [1][3]. Group 1: Consumer Complaints - Numerous complaints have emerged on social media and consumer platforms regarding the use of low-quality "flying silk" as filling in down jackets, which does not provide adequate warmth [1][12]. - A consumer named Wang Xin reported that her down jacket, advertised as containing 90% white duck down, was filled with short strands of material instead, leading to a lack of warmth and comfort [3][12]. - Another consumer, Chen Xi, experienced similar issues with a jacket claimed to be 100% down, which also contained strands of inferior filling material [12][13]. Group 2: Product Standards and Definitions - The article explains that "flying silk" is generally considered to be single strands that fall off from down or feather materials, which do not provide the same insulation as proper down [14]. - According to the national standard implemented in April 2022, down jackets must contain at least 50% down (including immature down) to be classified as such, with a maximum of 95% [14][15]. - The quality of down jackets is primarily determined by the percentage of down content, with higher percentages indicating better insulation properties [15]. Group 3: Expert Insights - Experts emphasize that the key to warmth in down jackets lies in the structure of the down, which traps still air to create an effective insulation layer [14]. - The article notes that the filling amount and the fit of the jacket also play crucial roles in its thermal performance, with a proper balance between snugness and looseness being essential for optimal insulation [15].