OP I'm with you...I leave at 0530 and I'm usually borderline cold unless it's about 75. The other day it was about 70 and after a few minutes I started digging through my backpack in the hopes I had left my long sleeve shirt in it, but no luck. But I'm usually good to go after about 5-6 miles and when the sun gets a bit higher. Dreading the fall/winter for sure.