Joe Rocket Reactor 2.0 Leather/Mesh Motorcycle Jacket :: New Enough, LTD
In my experience the Joe Rocket Reactor jacket is a Top notch product, it breathes really well and has one VERY important feature; the arms, shoulders are all perforated leather. It comes with a full back spine pad and as mentioned has optional for CE rated spine protector. The mesh is multilayered, there's 3-4 layers of THICK super heavy mesh fabric; in the event of a crash the mesh layers rub against eachother and won't cheeze grater/burn your skin. This also equates to a fabric that is probably thicker/stronger/more abrasive resistant than leather (albeit, not an actual road tested theory)
Keep in mind, my experience with the reactor jacket is limited to the first generation model; the one I linked is the second, though from what I can tell it's all a change for the better, with added features for things like a pocket for a replacement face shield.