Exactly what the title says. Im asking this because I live outside of Philly and this week has been up in the 100s in terms of weather and the humidity is high. I will be outside shooting a car event at Englishtown raceway this sunday and I want to know how others prepare for this kind of weather. Not so worried about my gear but talking in terms of staying cool and not sweating my ass of all day (which I probably will). Mostl likely will be carrying a sling bag with one more lens in it but thats about it really.