getting mud up my back?

Ok so I just put fender flares on my machine and it makes a huge difference in stopping the mud from coming up the sides.

But what can you do about the space between the rear side fenders and the roll cage. There is a gap there that the dirt and mud flings up through and coats the back of your left arm and back in mud.

What have you guys put in this space to fill it in? I stuffed a rag in there temporarily to keep from getting covered.