dealsmen's 100 cotton 2 piece thermal underwear set…

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If you are just going from your car to the office or doing simple things around your house, this might be an OK choice. Cotton is an exceedingly bad thing to wear as a base layer if you have to rely on your clothes to stay warm (camping, hunting, working outdoors, etc.) It hold moisture close to your body. Polypro, wool, or other specially designed moisture wicking fabrics are a much better choice.