(EDIT: oops - logged in as hubby on home computer - erinleigh)

The problem is I don't know - I didn't run through the summer due to knee injury, and our weather has been really nice and cool in Tucson thus far, so no chance to do a dry run. I've done 20-30 minute brick runs in the afternoon - temp upper 80s - but nothing long enough to really know what is best.

The ss white wicking top is underarmour - light and not the snug fit.