I'm still looking for a short sleeve armor jacket that I can put a Leatt OVER (would rather not cut up jerseys/tuck under spine guard). I absolutely need shoulder protection after multiple torn rotator cuffs/separated shoulders so the Core Saver is out. My latest idea is to get an Assault Pressure suit and just cut off enough of the back plates to fit the Leatt. My question to anyone who owns this jacket - do the shoulder pads stay reasonably in place when sliding on your shoulder? There are no straps around the arms like a Flakjacket without the elbow guards or a RF Rally jacket.