I was talking to a friend who has both a Vanson perforated leather jacket and a First Gear Mesh Tex jacket. He noted the Vanson was not as cooling as one might expect because at speed the front plasters to your torso and that pretty effectively stops the cooling. In order to restart some air flow you need to pull the front of the jacket away from your torso. He noted the FG Mesh Tex did not have that problem and cooled more effectively.
I've checked out both this FG jacket and just sprung for the Joe Rocket Santa Fe leather/mesh jacket. Perforated leather sleeves, mesh torso, double density foam armor (shoulders, elbows and back). Currently at a closeout price of $99.99 from AZ MotorSports in Phoenix, see:
http://store.azmusa.com/closprodspec-jr-santa.html
...only sold through their online store. Seems like a pretty good deal, hopefully it will be an effective jacket for cooling while offering some reasonable amount of protection. We'll see...
Tom