When you remove the doors off of a Jeep Wrangler (The one this was made for was a 2016 but I assume it might work for other years) the seat belts flap annoyingly in the wind. I designed this in an attempt to reduce the flapping by giving it a channel to sit in but also allow the belt to move freely. The top slides over the top of the plastic and the mid is adhered midway down the plastic. I used a double sided command strip. This still needs some work because the top needs to be a little tighter and the command strip did not last but a week.
DISCLAIMER: I am not an expert and am not responsible if you use this on your jeep. This is just my personal solution that might not be a good idea or safe.
USE AT YOUR OWN RISK!
Update: Both Pieces could use a thicker outside flap as they flexed in the wind so I added a V2 of both objects. I also added a longer flap that goes inside of the plastic on the top to give it a better grip. I will try to update tomorrow.