Our car seat gap fillers helps to prevent and block any thing from falling and dropping in between your car seat and center console all the way down under your car seat. It helps to promote safe driving so that you can concentrate on your driving without having to fish out small items that fall onto the gap filler. It fills the gap tightly so that it will stop any thing like cell phone, headphone, coins, credit cards, make up, keys, etc… from falling under your car seat. To fix, attach the built-in slot to the seat belt catch. It moves with the seat and never reinstall or re-adjust once it i