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.
Woolen clothes keep us warm in winter.
Cotton clothes are thin and do not have space in which air can be trapped.
Cotton clothes are thin and do not have spaces in their fabrics through which air can be trapped to keep us warm.
So cotton clothes do not prevent heat coming out of our body.
In the winter we use woollen clothes.
Woolens create a barrier to this and allow the body heat to stay in closer to the skin.
Also the air trapped between the woollen fibres prevents the flow of heat from the body to the cold surroundings.
It also prevents the cold air from coming in contact with the body.
Thus cotton clothes do not prevent heat coming out of our body.
The wool fibres trap the air in between them.
Because the wool fibers are good at trapping air and air traps heat in winter it traps the heat and does not allow it to escape and thats how the wollen clothes keep us warm in winter.
This air prevents the flow of heat from our body to the cold surroundings.
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Because it traps air in the small gaps of woolen cloths and it dosent escape.
Wool is a poor conductor of heat.