How to identify the authenticity of thermal underwear? Take a look at: the color of the product's packaging box, the company's trademark, hang tag and bar code. Some packaging boxes also have company trademark invisible anti-counterfeiting marks on the bottom. Second touch: All authentic products are light, soft, elastic, and feel good. Three pulls: Pull the collar, sleeves and waist of the underwear to both sides horizontally and vertically. If it is a counterfeit product, it is generally inelastic and will not easily shrink back to its original size after being pulled by hand. Four wears: Wear close to the body, have good comfort, and can feel the characteristics of warmth and cold protection, wind resistance and breathability, moisture conduction and moisturizing, gentleness and so on. 5. Washing: Authentic products can withstand repeated washing in the washing machine. They will not deform or shrink after being dried in a dehydrator, and they will remain firm after being dried in the sun. /mall