Ghost119, for what its worth. I lived in Memphis TN where I ran xc. Well, after school was practice - humid as hell bc of the mississippi bordering the city, and about 104 heat index every day. In college in Memphis, I wanted to run xc but knew the horrible butterflies before practice, b/c I feared the cottonmouth, and the way I would hurt in that heat would screw with me mentally. So before my soph year of xc, I ran in 100, 95, 94 degrees every day at noon, one or two, and learned to love it. Fast forward, today I am out booking along on a run at about 2pm in texas, listening to the radio and the weather guy said its 100 degrees - couldn't tell it was that hot at all. I think part of the reason I love that now is because I had to work to love it when I used to get weak and tired in it. I wouldn't necessary recommend going out tomorrow in 100 degree heat, might need to start slow on that.