A Parent's Guide to Booster Seats - Page 2 May 7, 2001 at 7:00 PM CDT - Updated July 12 at 2:56 AM TYPES OF BOOSTER SEATS Belt-positioning booster For a child 40 to 80 lbs. The child sits in the booster seat and uses the vehicle lap and shoulder belts for restraint. Lap and shoulder belts together offer better protection than lap belts only. Are available in high back and backless models. High back booster with 5-point harness With harness Is a forward facing child safety seat for a child 20 to 40 pounds or more. The 5-point harness provides full body protection. Child safety seat is attached to vehicle with vehicle belt system and tether (if seat has one). High back belt-positioning booster At 40 pounds the harness is removed. Child safety seat converts to belt-positioning booster. Child uses the vehicle lap and shoulder belts for restraint. Use without tether (unless stated in manufacturer's instructions).