How I stopped my child's booster seat from swaying around

Donnie and I have always been very firm about seatbelt use since we became adults. We don't allow anyone to ride with us who won't wear one. (sorry, Dad! But no can do) Our kids have actually cried if we started to drive thinking they had buckled up, but they hadn't. They are convinced that it is very important.
But as safe as we think they are, the lapbelts are not protecting our children in booster seats. The lapbelt is designed to give a little slack. That causes the seatbelt to be too loose, allowing the booster seat to rock around while doing simple curves, turns or bumps. Children can sustain head injuries from hitting a window. The slack has also been proven to be a cause of children slipping under the seatbelt in an accident, or being thrown from the seatbelt during a roll over! This is a deadly situation.
I was so excited when Mom Central offered the Seatsnug for review.
This device attaches to the seat belt and secures it so there is no slack. The booster is much more stable, making for a safe ride for my children.
Go watch the video on what this product does, it will amaze you how unsafe your child is in a standard booster. HERE
There is an on/off switch that allows you to use it for adults if you need to. This is just a perfect device to use to keep your child safe and still maintain your seat belt use.
I only wish it were more easily moved from vehicle to vehicle. We are renting a car this week and would like to use it for our trip, but it is a little time consuming to remove. It is actually not to hard to install, but watch the directions a few times to be sure, because it can be a bit confusing if you just read the paper instructions.