Ahh, sharp eyes, I was still adjusting and fiddling with it. The bottom portion of the cover has hooks that can hook onto the back of the seat and then they are connected to a drawstring that cinches the whole bottom portion tight to the lower bench portion of the seat and also helps pull it tight to the back. I was playing with tightening those hooks vs. the drawstring, but I think once I find something to hook the hooks onto I'm happy with I'll just use the drawstring to cinch everything up tight. I might just rig something out of paracord so the hooks have something convenient to hook onto and can take the cover on and off quickly.Why did you have to use an NRS strap on the third image?