by 
The Curious Bag
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<h4 class="dechead">On One Hand: You Should Wear an Undershirt All the Time
According to Karemar, undershirts will absorb your body's perspiration and in the process of evaporation cool you. HisRoom recommends undershirts that are 100 percent cotton because of their absorbency, which facilitates the evaporation/cooling process.
On the Other: An Undershirt's Weight Will Make You Warmer
Your body constantly generates heat, and physical activity increases body heat. Wearing an undershirt makes you warmer because of the extra weight. If you're a person whose metabolism generates a lot of body heat, wearing an undershirt increases your discomfort.
Bottom Line
An undershirt made of 100 percent cotton is very lightweight, so any weight increase will be minimal. Also, your undershirt will absorb any perspiration caused by the extra weight, and evaporation will help keep you cool.
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