I wear a Rev'it mesh jacket...in 110+ Arizona heat.....not the most protective, but will keep you in one piece. I find at these temperatures, it's more important to be cooler and not get overly dehydrated or get heat stroke, as that will make you more likely to crash anyway.
Also, Alpinestars half boots and Bell revolver evo helmet....this is apparently "too much" gear for most people here....
Rev-It Engineered Skin Leather/mesh combo, with same pants. Sidi Air vented boots, sometimes wear Bohn Armour under Kevler Draggin' jeans.
Lots of stops at river/creek/ lake to wet down for cheap air conditioning.
I have a Bilt leather/ textile hybrid jacket. Replaced the armor in the shoulders and elbows with Dainese armor. And put in a Dainese spine protector. The jacket has the best flow that I have found but the armor that came with it was shite. So far the jacket has held up like a champ through one season. Stitching is pretty good for Bilt. We'll see how long it lasts.