Keeping children safe in crashes:
Summary of Institute research on lap belts and booster seats — study conducted with Children's Hospital of Philadelphia
Child passenger safety from SafeKids USA
Car safety seat information for families from the American Academy of Pediatrics (AAP)
Child passenger safety from the National Highway Traffic Safety Administration (NHTSA)
Lower attachments connect to anchors in the seat. The two common types of attachments are C-hook (top photo) and flexible hook (bottom photo).
Anchor points usually are marked on the seat.
For forward-facing seats, top tethers are most commonly attached to anchors on the rear shelf (photo below) or on the vehicle seatback, but check your vehicle owner's manual for the location in your vehicle.