How fast do you walk to your stand? I know, 90 degrees is very hot and you'll still work up a sweat but maybe if you slow your speed down going to the stand you might not work up as great of a sweat. Kind of depends on how far you walk to your stand too and how early of a start you get in the mornings. This past weekend here in Illinois it was around 86 degrees and I hunted behind my house....only about 150 yds. and I worked up one helluva sweat....and I was taking my time.