Why do we wear woollen clothes in winter and cotton clothes in summer?

During summer we perspire more due to high temperature. This absorbs the heat energy equal to the amount of latent heat of evaporation from our body during evaporation. As cotton is a good absorber of liquid, it absorbs the sweat and expose it to the atmosphere and help in easy evaporation. Hence, we wear cotton clothes in summer to keep our body cool.

During the winter we wear woollen clothes. Because it has lots of air space. As air is a bad conductor of heat, it works as an insulator and doesn’t allow our body heat to escape. Hence, we wear woollen clothes in winter to keep our body warm.