Question

why woolen clothes gives us heat?

Answer 1

Cotton clothes are thin and do not have space in which air can be trapped. Thus, cotton clothes do not prevent heat coming out of our body.Woollen clothes keep us warm during winter because wool is a poor conductor of heat and it has air trapped in between the fibres.
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Answer 2

wool is a non conductor of heat
so it does not transfers the inner heat of our body out nor does it transfers the cold from out to in


moreover the air trapped inside the woolen cardigan is also a non conductor of heat it also keeps us warm