I think Evaporative cooling is a life saver! ( not the application your thinking)
I carry a 1 qt spray bottle with me during the really hot days and spray myself (head,face,arms,and such) while on a 12 F roof fixing someone else's
A/C and it helps make it alittle more bearable.
Just my 2 cent's ( It's been in the upeer 90's and 100's the last week here in Pa.)
Good idea. I used to soak down a cap to keep my head cool when I was in the field. It was 102 degrees in and around Reading on Tuesday when I was driving around that area. Who are you with in Reading?