Core Viewpoint - The article highlights the rising concern over low-priced down jackets filled with inferior materials, particularly "flying silk," which misleads consumers regarding the quality and warmth of the products [1][2]. Group 1: Consumer Complaints - Numerous complaints have emerged on social media and consumer platforms regarding down jackets that do not meet quality standards, with users reporting that the jackets contain "flying silk" instead of genuine down [1][2]. - A consumer named Wang Xin reported that her down jacket, advertised as containing 90% white duck down, was filled with short strands of material that did not provide warmth [1][2]. - Another consumer, Chen Xi, experienced similar issues with a jacket claimed to be 100% down, which revealed strands of inferior filling after washing [2]. Group 2: Understanding "Flying Silk" - "Flying silk" is defined as single strands that fall off from down or feather materials, which do not provide adequate insulation [3]. - Genuine down consists of down clusters that trap still air, creating an effective thermal barrier, while "flying silk" lacks this property [3][4]. Group 3: Standards and Regulations - The national standard for down jackets, effective from April 2022, mandates that down content must be at least 50% and can go up to 95%, with specific labeling requirements [3][4]. - The classification of down jackets is based on the percentage of down clusters, with increments of 5% [4]. Group 4: Choosing Quality Down Jackets - Key factors for selecting a quality down jacket include down content, fill power, and the fit of the jacket [5]. - Higher down content correlates with better insulation, while the fill power indicates the thickness and warmth of the jacket [5]. - The fit of the jacket is also crucial; a well-fitted jacket should allow for adequate air trapping without being too tight or too loose [5].

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].

Core Insights - The article discusses the challenges consumers face in purchasing genuine down jackets priced below 300 yuan, highlighting the production costs and quality standards associated with these products [1][2]. Group 1: Production Costs - The core costs of down jacket production include down materials, fabrics, labor, and additional costs such as design, logistics, and taxes [1]. - Down materials significantly impact the overall cost, with goose down accounting for approximately 50% of the total cost, while duck down contributes about 30% to 40% [2]. - The estimated core cost of a down jacket, assuming 90% down content and a filling weight of 150 grams, ranges from 126 yuan to 248 yuan, making a retail price below 300 yuan unlikely for quality products [2]. Group 2: Quality Standards and Regulations - The Chinese Down Industry Association has introduced a new standard to clarify the distinction between "down silk" and "waterfowl silk," aiming to protect consumer rights and improve product quality [3]. - China's down jacket standards are now on par with international standards, with several key metrics being more stringent than those in other countries [4]. - The market regulation authority is promoting a quality grading system for down jackets, focusing on key indicators such as down content and loftiness, to enhance product quality and reduce irrational low-price competition [5].