Cotton is one of the worst fabrics one can wear in the heat.

Cotton is hydrophilic. It attracts, absorbs and holds onto water. A fabric which holds onto water does readily release it into the atmosphere so does not provide evaporative cooling, or provides it at a greatly reduced rate compared to other fabrics of similar weight.

A hydrophobic fabric does not absorb and hold onto water but passes it through and releases it easily so it can evaporate and cool. A hydrophobic fabric is what is needed.

This isn't something I made up. This is basic ninth grade science.

http://www.7meshinc.com/technology/knit/


-Tim-