I’d go for something like this Revi’t Air Jacket:
I have the Typhoon, as the Air was sold out at the time.
Some of the more expensive mesh armour have straps where the armour is so they stay on your body without moving.
Im never bothered with the heat here… compared to riding in greece where you **have ** to ride in flipflops,swimtrunks and sunglasses 
Textile dainese summer jacket, esquad denim jeans, and lightweight summer gloves for hooning about in and riding to croquet matches and country pubs.
If your gonna rag it then you best not skimp on your leathers, race gloves, back protector etc.
what’s this summer you’re talking about O_o
anywho, leather trousers and a textile jacket, inner part taken out, only used in winter. when going for a bimble, I wear my Büse mesh below the jacket, but then it does tend to get warm indeed :w00t:
biggest waste of money going…
do what everyone else does and put a t-shirt over it…gonn do alot if you bin it isnt it…specially if its at any decent speed.
Vented textile jacket + leather bottoms/ vented textile bottoms are the way to go.
them body armour vest’s are shite! come off at a decent speed and it WILL rip its self apart.
great for slow speed stunters or moto-x, crap for road use.