You should know that once the temperature is low enough, the clothes you wear outside can keep out the cold, but because the temperature is too low, the effect is not ideal. As a northeast person, I have a deeper understanding of the definition of winter. Take the temperature in my hometown Heihe as an example. The lowest outdoor temperature is MINUS 45℃, although wearing camel hair pants and down pants can also keep out the cold. However, most vendors who sell goods outside will choose "3-5 Jin cotton trousers" made of cotton wool, because these cotton trousers are not only thick, but also heavy, which can not only keep out the cold, but also "wind". So if you want to keep out the cold, it is better to use traditional cotton wool as cotton trousers.
Today's camel hair down cotton trousers are not outstanding in warm keeping performance, but because their overall performance is much stronger than traditional cotton trousers, such as thickness, weight, style and so on. People choose these because of convenience. Take herding sheep in the mountains in winter in Northeast China as an example. Nowadays, people basically wear down jackets and cotton hats, but in the past, they used to wear dog hair hats and sheep Mao Mao vests, and the wool and cats on the hats were turned out. The reason for this is that when the cold wind blows on the human body, the hair turned out will swing with the wind, blocking the wind blowing into the clothes. In fact, camel hair and down are the same, and their warmth retention performance is similar.
In fact, it is the "cashmere content" that determines the warmth retention of these two kinds of pants, not the pants made of any material. Although the material will affect the warm-keeping effect, if compared with down and camel hair, the difference is really not big, just because the merchants deliberately make it out for gimmicks, just like carbon crystals, silicon crystals and graphene heaters.