Force Fit XL Children are not only safer, but can see better and are more comfortable in a booster seat that allows the safety belt to fit and function as intended. Booster seats do this by raising a child to a height so that a lap and shoulder belt fit properly. The lap belt should ride low, below the hip bones and across the top of the thighs, not on the stomach, and the shoulder belt should cross the middle of the chest and shoulder or collarbone. http://www.strongtesterone.com/force-fit-xl/