市场监管部门发布消费提示，冬季保暖“三件套”这样选

Core Viewpoint - The article discusses the importance of selecting winter warming essentials, specifically down jackets, thermal underwear, and thermos cups, emphasizing consumer awareness and product standards to avoid misleading claims and ensure quality. Group 1: Down Jackets - Consumers should focus on the down content and be cautious of misleading marketing practices that may confuse the type of filling or mislabel down content [2] - A qualified down jacket must meet specific standards, including the use of only four types of natural down and a down content of at least 50%, with recommendations for 80% or higher for better insulation [2] - The total down weight should be chosen based on style and size, with short jackets recommended to have 120-300 grams and long jackets 200-420 grams, with adjustments for extreme cold [2][3] Group 2: Thermal Underwear - The concept of "self-heating" thermal underwear is misleading; clothing cannot generate heat but can only retain it [5] - There are three main principles of thermal insulation: static temperature retention, dynamic heat storage, and reflective heat retention, each utilizing different materials and designs to minimize heat loss [6] - Consumers should check the composition of thermal underwear, prioritizing materials like cashmere and wool for warmth, and ensure compliance with safety standards [7][8] Group 3: Thermos Cups - Thermos cups should be made from food-grade materials, with stainless steel types categorized into 201, 304, 316, and 316L, each with varying levels of corrosion resistance [9] - 201 stainless steel is not recommended for food contact due to its lower corrosion resistance, while 304 is commonly used but can leach metals when in contact with acidic substances [9] - Consumers are advised to select thermos cups that meet national standards and to check for smooth, scratch-free interiors to maintain safety and longevity [10]