宇宙第一疑惑：干燥的北京冬天，为啥人人都把防水外套当“市服”？

Core Viewpoint - The article discusses the popularity and practicality of wearing outdoor jackets, specifically "冲锋衣" (softshell jackets), in northern China during winter, questioning their necessity and effectiveness in urban settings [1][3][12]. Group 1: Definition and Standards - The national standard defines "冲锋衣" as outdoor clothing made from waterproof and breathable fabric, designed for outdoor activities [5]. - Key features distinguishing "冲锋衣" from regular jackets include waterproof breathability, colorfastness, and durability [8][9][10]. Group 2: Performance Evaluation - The performance of "冲锋衣" is evaluated based on three main criteria: waterproof breathability, colorfastness, and durability against wear and tear [6][9][10]. - The waterproof breathability is assessed through surface moisture resistance, hydrostatic pressure tests, and moisture permeability rates, with a grading system from I to II [8]. Group 3: Practicality in Northern China - The article argues that the waterproof feature is less relevant in northern winters, where conditions are typically dry and cold, questioning the need for such jackets [12][17]. - The focus for winter clothing in northern regions should be on wind resistance rather than waterproofing, as wind chill significantly affects perceived temperature [17][21]. Group 4: Recommendations for Winter Clothing - Practical suggestions for northern workers include choosing jackets that effectively block wind, with features like hoods and elastic cuffs, rather than prioritizing waterproof capabilities [17][21]. - The article also highlights common issues with winter clothing, such as noise and static electricity, suggesting solutions like using fabric softeners and maintaining humidity [22][24].