Most cashmere thermal underwear sold in the market is made of multi-component composite sandwich materials. Generally, adding a fluffy chemical fiber or ultra-thin film between two layers of cotton cloth or chemical fiber fabrics can effectively prevent the air inside the clothes from exchanging with the cold air outside, thus playing a better role in keeping warm. If you wear it on your body, it will have an airtight and hot effect.
In autumn and winter, the weather is dry, the skin absorbs less water from the air and the cuticle is dry. Wearing thermal underwear may aggravate the skin's lack of water, resulting in dry and itchy skin. Clothes containing chemical fiber components have a disadvantage in keeping warm, that is, they are easy to rub with human body and external clothes to generate static electricity.