Originally Posted by
Carbonfiberboy
Do you think the extra layer under the jersey is cooler than just a jersey with nothing under plus sun sleeves? I always ride with my jersey unzipped down to my pupik when it's hot. No sun hits the chest on a road bike.
No, I would not layer it for cooling. It's the wicking evaporation that cools you. I'll wet mine at a water source for more cooling effect, although it dries very quickly. Blocking the sun provides additional benefits.
As far as layering is concerned, I've layered it on top of my merino wool layer for
warmth.