What if my car has only lap belts in the back seat? Lap belts work fine with rear-facing–only, convertible, and forward-facing seats but can never be used with a booster seat. If your car has only lap belts, use a forward-facing seat that has a harness and higher weight limits. You could also: Check to see if shoulder belts can be installed in your vehicle. Use a travel vest (some can be used with lap belts). Consider buying another car with lap and shoulder belts in the back seat. What is the difference between high-back and backless boosters? Both types of boosters are designed to raise your child so seat belts fit properly, and both will reduce your child's risk of injury in a crash. Highback boosters should be used in vehicles without head rests or with low seat backs. Many seats that look like high-back boosters are actually combination seats. They come with harnesses that can be used for smaller children and, later, removed for older children. Backless boosters are usually less expensive and are easier to move from one vehicle to another. Backless boosters can be used safely in vehicles with head rests and high seat backs.
