http://www.strongtesterone.com/force-fit-xl/

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Force Fit XL Generally, kids from four to eight years old, and from 40 to 80 pounds, need to be in a booster seat. Some smaller children may need a booster seat until age ten or longer.Indicators that a booster seat is needed include an inability to sit all the way back against the seat back; an inability to bend the knees comfortably at the edge of the seat; a safety belt that does not cross the child's shoulder between the neck and arm; http://www.strongtesterone.com/force-fit-xl/