albertaduke
former airline pilot without the big bucks
OK - Some thoughts - based on experience
THE NO HOLDS BARRED WINNER IN KEEPING HOT SUN FROM BURNING YOU IS LEATHER.
Ventilated leather allows air through.
Mesh is fine Under arms and such - but across the shoulders and down the lateral parts of the back (where there's generally no back pad) - leather.
I agree 100% I have worn for the past 31years the same leather jacket and it cut the heat and the cold like no other the brand, I do not know
suffice to say it is the spec leather of the swedish military motorcycle dispatch corp ,and I bough it from an old rider who already had it for many years ...talk about longevity!!