看：一看厂家。有的“空壳企业”生产的产品，没有相关的生产设备与质检设备，产品质量严重失控。消费者应当选择专业内衣厂家生产的保暖内衣，看产品是否颜色、尺码齐全，有无四季品种。二看色彩和光泽。专业内衣生产厂家采用的都是进口环保型染料，色泽鲜亮，不易褪色。三看 Look: a look at manufacturers. Some “empty shell business” products, there is no relevant production equipment and quality inspection equipment, product quality seriously out of control. Consumers should choose the professional underwear manufacturers thermal underwear to see if the product color, size, with or without seasons varieties. Second look color and luster. Professional underwear manufacturers are using imported environmentally friendly dyes, bright color, not easy to fade. Third look