As wool is a very good insulator and a poor conductor of heat woollen clothes keep the body warm and protect it from the cold winds.
Woolen clothes keep us warm in winter.
Cotton clothes are thin and do not have space in which air can be trapped.
Also the air trapped between the woollen fibres prevents the flow of heat from the body to the cold surroundings.
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The wool fibres trap the air in between them.
In the winter we use woollen clothes.
Wool is a poor conductor of heat.
Thus cotton clothes do not prevent heat coming out of our body.
It also prevents the cold air from coming in contact with the body.
In summer we wear cotton clothes because cotton clothes does not trap air inside it and heat radiated by body goes out so it is advised to wear woolen clothes in winter was this answer helpful.
Woollen clothes keep us warm during winter because wool is a poor conductor of heat and it has air trapped in between the fibres.
Woolens create a barrier to this and allow the body heat to stay in closer to the skin.
Certified by meritnation expert saumitra deshpande added an answer on 29 5 13 we wear woollen clothes in winter because air is a poor conductor of heat and woollen clothes do not allow the transfer of body heat to the environment and keep us warm.
Cotton clothes are thin and do not have spaces in their fabrics through which air can be trapped to keep us warm.
This air prevents the flow of heat from our body to the cold surroundings.