Mesh gear in my area of the country (I'm in a Scorpion Master Mesh right now) works year round. I switch to solid textile during the full blown winter months but I've ridden in well vented textile gear during 100+ days also. You sweat a bit but honestly you are much better off core temp wise if you are sweating a little and having it stay around for a bit then you are ridding without and having the sweat evaporate instantly.
I also wear long sleeve sweat wicking shirts under my riding gear.
Glock 17 (Dad's old duty sidearm)
And some other stuff