Well Doug, I did an "Arizona test" for you today..... 34C+
This "evo" works just as well as their 1st version.
I ride in full leathers, pants have a little perforated area so I wear longjohns underneath. My jacket has vents on the lower arms and the front area along the zip can be removed, leaving a sturdy mesh fabric.
I never felt the heat getting to me. When stopping and placing my inside the vest it feels "cool". It needs airflow to function.
Macna since released a V3 "hybrid" .... A step back imho, you either soak it (versus V1 and V2 having the water inside) and put it on wet. Like a Hyperkewl Or add "cool packs" you activate by placing them in a fridge.