这种羽绒服穿得越久，危害越大！

Core Viewpoint - The article emphasizes the importance of understanding the quality indicators of down jackets, particularly focusing on down content, material properties, and potential health risks associated with inferior products [1][5]. Group 1: Down Quality Indicators - Down jackets' warmth is primarily determined by down content, which should be at least 50% according to the new national standard [13]. - The filling weight, or "充绒量," is crucial; a higher filling weight (≥85%) indicates better warmth [13]. - The loftiness of down, which refers to the volume occupied by an ounce of down, is essential for insulation efficiency; higher loftiness means better warmth and lighter weight [13]. Group 2: Material Properties - The fabric of down jackets serves as the first barrier against heat loss and cold air intrusion [9]. - Key fabric properties to consider include windproofness, water resistance, breathability, and fabric density, all of which contribute to the overall warmth and comfort of the jacket [11]. Group 3: Health Risks - "Glue down" is a fraudulent practice where chemical agents are used to artificially increase down content, posing health risks to consumers [6]. - "Dust down" consists of short down fibers and dust generated during production, which can lead to respiratory issues and skin allergies if inhaled or contacted [6].