What Is Warmer, Cotton or Polyester?

By Staff WriterLast Updated Apr 14, 2020 2:51:49 AM ET
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Polyester is much warmer than cotton and in cold weather, cotton should not be worn close to the body, particularly in undergarments. Cotton does not hold heat well when it is dry and when it is damp or has absorbed body moisture, it will allow heat to move right through.