Sure Fit does what others cannot. Sure Fit properly positions a shoulder belt while allowing the lap belt to remain in its correct place ? snug across the child?s hips. With its unique design and attachment location, Sure Fit provides a natural seat belt fit that is both comfortable and correct. Flexible, lightweight and extremely comfortable, Sure Fit attaches in seconds without using snaps or buckles to secure the shoulder belt. Thoroughly crash tested, it is incredibly strong. This is how a seat belt should fit.