I got a medium FLy Patrol jacket from Rocky. It looks like well made, high quality air vents for TX summer. But, to my horror, this thing doesn't have any armor in it. It's the first motorcycle jacket that doesn't have any armor. At least, it looks to have thick fabric that will resist abrasion by sharp gravels. So, my options are return it, or buy some kind of separate armor system. So, what is the thinnest armor that can go under the jacket? There's not much room in there.